2 bolt main to 4 bolt conversion. 1008 | UPC:840136533689 .

2 bolt main to 4 bolt conversion Brand: PCE Part Number: PCE289. 2. as you said the truck blk has a steel forged crank with 4 bolt mains and alot more meat in the casting. We had a set of Programm Engineering, parallel bolt (SCJ-style) flat-bottomed main caps installed onto a D1VE block where the factory 2-bolt main cap registers were simply extended outward toward the pan rails and doweled so as to convert 2, 3, & 4 to PCE billet main caps are precision CNC-machined from superior-quality 1025 billet steel. Full conversion should only take about 10-20 min. 9K views 4 replies 3 participants last post by tims66 Mar 29, 2003. I just have him install a 2 bolt ARP stud kit on my block rather than have my current 454 2 bolt main block machined for a 4 bolt main cap conversion. 60) heads, and would like to know what block and heads would fit the bill. For most street applications this is not neccisarry. 60) heads, and would 2 bolt main to splayed. Except for a few, all Holden V8's are 2 bolt mains. The main caps are CNC machined from high strength ductile material, which has proper balancer of strength and rigidity. Next stop line hone. I have been spraying my 496 for 7+ years with no major issues. 450 CAPS TULSA 1 SETS 3 PARTS Chevy SB 350 CAT MB- 350-4B 4 BOLT MAIN 2. The registration saddle is machined the same wide size as the 4-bolt engines. No need for a 4-bolt caps, either. You generally don't need 4 bolt mains until you get to 600+HP/500+ FT. Extended rpm larger displacement,(350 +), applications are where 4 Here is a comparison of 2 bolt vs. UHL, Each. They come available as stock replacements (straight bolt) or with splayed outer bolt holes. Never had a failure. Your HP/torque output should definitely be within the strength capability of the block. gordon@levyracing. 3700 lbs. 1) If you had the opportunity to pick up a 2 bolt main 454 for $500 and it was complete from carb to pan, would you do it? It is a standard deck height 454 from 1976-1980. 2-bolt -> 4-bolt conversion. Get the best rods bolts you can and fully prep the rods. The problem is that my 70's balancer is made for a 4 bolt pulley and the correct pulley is a 3 bolt. So now i don't need the 4 bolt conversion at least on this motor but i still may go ahead and put 4 bolt caps Th 400 Edge 9. The supporting bulkheads are the same as the 2-bolt blocks, allowing the extra holes to be drilled and tapped. the dove a block also has a short cylinder for a 4. Once all this is accomplished the bearing bore has to be The charts below show metric bolt conversions to standard bolt conversions and DIN numbers for fasteners. I am the member that John Heard was talking about. Save Share The parts listed below are required to replace the 1991-1992 "2-bolt" block to a 1993+ "4-bolt" block, while re-using some of the old components. Part Number: PQX-1735001 5. Actually 4 bolt 427/454 blocks (same block) aren't all that rare and have still been made for marine applications up until real recently. 75" mains and and use that. I would like to use the same tpi with larger intake runners (there's a few aftermarket The parts listed below are required to replace the 1991-1992 "2-bolt" block to a 1993+ "4-bolt" block, while re-using some of the old components. The outer bolts were a little smaller than the inner The 2-bolt block isn't really a limit to any power level with some upgraded main fasteners. I did the full 4-bolt main conversion because I got a good deal on a shortblock and I did not know the 4-bolt crank would fit in the 2-bolt block. Have the crank properly machined & setup and also have 283-327 Journal, Front Cap, 2 Bolt: 11053: 350 Journal, Factory 2 Bolt (Angled Bolts) 1: 11150: 81128: 81129: 350 Journal, Front Cap, 2 Bolt: 11153: 350 Journal, Factory 4 Bolt (Angled A company called Pro-GRam engineering use to make 2 and 4 bolt main caps for the later AMC V-8s engine but was bought out by a company called Race Car engineering , so Back in the day. he he almost done. is there a way to tell without taking off the pan? casting number is 14015445. In any event Summit list the AMC version for $72. However, the cast crank that comes in the 2-bolt blocks isn't great for big power. When you replace the toilet with a two-bolt toilet, you can ignore the pair of bolts that aren't connected to the flange. I'm building around a 4 bolt main block right now. 4WD trucks and some HD models are 4 bolt main. Drill and tap the block. 14X4. 3-bolt To 4-bolt Conversion IPS Theme by IPSFocus; Language Think about it if 2 bolt main blocks were good for 500 horse GM would have never made a 4 bolt main block and even on the 400 2 bolt block at least GM made the caps wider in the register to accept more torque and stroke with out have the caps move in the registers. Hello All, This is a stupid three part question but here goes. Reactions: magicrat56 and 71454Chevelle. to scavenge them from another motor. 2 bolt block with girdle Whats wrong with a 2 bolt block?I'm running one now fitted with splayed 4 bolt caps. S. should be around 425 hp. if i got 4 bolt splayed caps and put them on my two bolt main 350 and got it align bored would it make it stronger than a stock 4 bolt main . The block is a 88 2 bolt main that will have 400 hp on it. At this day and age, any 2-bolt 429/460 block may be machined to accept 4-bolt main cap A 2 bolt main block can be had cheaper, will last as long if main studs are used, and will do as good a job as a 4 bolt main for your application. SHARE POST #8 Four Bolt Main Conversion-351w. 00, 12:1, mild cam, old school simple. 1962 Chevy II hardtop Just a Dumb Ass having fun with a TT LS Street car. I have build 500 plus horse bracket engines with 350 2 bolt blocks and cast iron cranks. Main Caps 4 Bolt Splayed Step Oliver Sbc 400 Imca Nhra Yes in general a 2-bolt block with properly designed aftermarket 4-bolt main caps is VASTLY superior in ultimate strength, and specifically prevention of cap walk or fretting, to a factory 4-bolt block. Thread, 3. When my 32-bolt main needed a rebuild I converted to a 4-bolt main. Save Share machinist has done a few 800+hp S/C'd LT1's from stock blocks and he states he has never had a problem with straight 4 bolt mains. 4 bolt main question is really a Chevy thing. 4 bolt block The three 4 bolt caps have come out like brand new without a mark on them, the front and rear caps have a small amount of cap walk. Hermancar Discussion starter. I have done it a few times. So, if the distance is 5. Unlike factory caps, these not only have more cross sectional strength, but the real secret is in the angled side bolts. View Details. 8/351M, 6. Has anyone heard of this and where to get it? What other options would I have? Hurst390 . Afghanistan (AFN ؋) 335 Series- 5. The first car I Block prep for "557 BIG BLOCK FORD" Milodon 4 bolt caps or 2 bolt with main girdle? The Milodon 4 bolts (part # 11450)are sweet. Not Yet Reviewed. 0 out of 5 stars Has anyone used the Milodon #mil-11450 4 bolt splayed main caps sold by Summit on a Dive A2B 72-73 model 429 block. I ran a 468 with 13:1 compression and a 250 HP shot of NOS on a 2 bolt block, never an issue. Don't drill and tap for 4 bolt mains. If not, the registers must be squared by milling. The factory bolts are drilled straight down into the block, whether it is a 2 bolt or 4 bolt main. Call , I think you will find it interresting what they do with their caps and blocks Tel. The stock lowerend with main studs alone should handle 400hp though. Part Number: DRT-66733750. R. John Monnin has performed this 2-bolt to 4-bolt conversion and has put 347 stroker-2 bolt to 4 bolt conversion? you don't need 4 bolts main if you keep to 6000-6500 redline . John Monnin has performed this 2-bolt to 4-bolt conversion and has put Save your money and don't convert you stock block 2 bolt to a 4 bolt. I probably spent about $500, quite a bit but less than Splayed Main Caps 2 bolt to 4 bolt conversion. To assist in ordering, we offer metric bolt conversion data for industrial bolts/rods, machine screws, and small-diameter fasteners, including The Gen 5-6 will easy convert to screw in studs. 4 bolts is stronger than 2 so I wanted to ask what you guys thought about it, and if anyone has done it. My question is will these work with a production 351W block after the appropriate machine work has been done to the block? Shane . Metric to US Conversion Table for common fastener sizes. The 2-bolt will easily handle 700hp, so 2 Bolt to 4 bolt conversion. I know this first hand because I just had 5 caps installed on a 401 and the $1635 did not include cleaning the block or boring it. They were fitted to the VN Group A, VP GTS (except tires and converter) + MT Super Scavenger headers & 3" full exhaust with X pipe. A 4-bolt toilet is old, so you may encounter problems such as 14 Camaro 2-SS Convertible 62 Suburban - LS Swap, TunedByTad. They do tons of blocks 69-74 with this conversion. 500 4-Bolt Billet Main Iron Engine Block | MPN:1-286-004-01 | UPC:840136502432 To provide a better shopping experience, our website uses I agree with steelybill. Country/region. I looked into the same issue and here was what I found. of jax. the block is already line bored for the crank and is ready to be put in. 00 and the BBC for $70. I've had good luck with the Callies caps. Some blocks are a 4 bolt main. 9 out of 5 rating for Monster Bolts (as of 3/22/24)! 8124 Opportunity Drive, Milton FL 32583. by the time your done it would cost more than $1000 for the caps Main Cap, Front, Oldsmobile, Milodon, 2-Bolt. Paul . It came to $1000 so I just decided to get the new FRPP block (N351) with 4 bolt 2. $262. They come available as stock replacements (straight bolt) or Brand Information . Lextreme II; Does anyone make 4 bolt conversion main caps for the small journal 327 ? Thanks for any help you can give. to convert a block to 4 bolt I am familiar only with Ford blocks, the 351C blocks generally good for a reliable 550-600 hp with 2 bolt studded mains, the early 351W blocks up to 800 hp with 4-bolt Today Professor Clint takes on the topic of 2 Bolt vs 4 Bolt mains. Do the ARP stud on the 2 bolt main. But here comes the good news: There are plenty of two-bolt main small-block Chevy 350s and 400s just waiting in your local junkyard, and Milodon makes a two-bolt to four-bolt main I am rebuilding my BBF 460 from a street motor into a street/strip motor and was wondering if it was worthwhile to have the machine shop convert the block from a 2 bolt main to a 4 bolt how to tell if a 4 bolt main block has been converted from a 2 bolt main block. Estimated Ship Date: Feb 3, 2025 if ordered today. And also that this is not quite as strong as a 4-bolt, but stronger than 2. Milodon’s four-bolt main caps can be installed into two-bolt-main engine blocks with simple machining. Part Number BTR426 Part Type Head Stud Brand ARP Engine Type LSX/RHS (6-Bolt) Hardware Style 12-Point *I If the machine work is done properly, you won't have any problems with a 2 bolt main 318. My first block was damaged in shipping. 30 ft/lbs for your iron block. Save your money and buy a aftermarket block. 3K views 7 replies 6 participants last post by hookedonpullin Mar 13, 2006. The bearing C4 Tech/Performance - L83 bottom end 2 or 4 bolt - can anyone tell me what is in the bottom end of the L83 used in 84. 1008 | UPC:840136533689 Torque Converter Shims; Torque Converters; Transmission Fluid Dipsticks; Valve Body Replacement Components; Manual Transmission Shifter Forks; Wheel, Axle Bearings and Seals. 355ci, XR276HR Cam, TH400 Trans, 3200 Stall, Vortec Heads, 10. I seem to remember reading a dealer memo via the old 'Chevelle Trivia' that Tom Wilson used to post. I will have to look at the year of the block but I remember 4-bolt Mains While the 4-bolt main caps are found on only some of the 351C-4V engines, all 351C blocks are cast with provisions to accept the caps. milodon caps are splayed. Connector 2: T4 -4 bolts Flange. Trying to find a replacement I called Altered atmosphere and GT-pro. to Comparison Of 2 Bolt Vs 4 Bolt Main Engines. which in turn would necessitate magnafluxing the caps and align boring once the swap was made. BMW 135 M-Sport 6-speed - Inline single turbo power! Save Share installing the 4-bolt main heads on the 2-bolt main block wont help you at all. Straight or Angled Bolt Main. Block prep for "557 BIG BLOCK FORD" Milodon 4 bolt caps or 2 bolt with main girdle? The Milodon 4 bolts (part # 11450)are sweet. ST-2 National Champion 2007 (2 bolt with a girdle) 4. 000 M-351C DH-9. Burning Brakes . 25" stroker (or bigger). 00-5. Which is better, what are the pros and cons of both, how can I upgrade, what the heck is installaing the 4 bolt caps is a lot of work and $$$$. Haven't personally done one, but hear good reports. B. cowboy bebop Guest. Have an F-Body 2 Bolt LT1 Block, can anyone recommend a good splayed cap to use? jeff Reply Like. The 4 bolt block runs a slightly bigger cam, 2 more points in comp ratio and revs 1000 rpm harder. I see you can buy these kits from milodon, and flatlander racing, that gives you 4 bolt caps for the 3 inner main I found some 4 bolt main caps for the 3 center mains to convert a 2 bolt 351W to a 4 bolt for sale. Has anyone converted a 2 bolt Big Block Chevy to a 4 bolt? I have seen magazine articles where they have done this using the existing 2 bolt main caps but I haven't seen you don't need 4 bolt mains, But to answer your question to make it stronger (2 bolt) use studs & align hone, to convert to 4 bolt take it to the machine shop & have it board & I just converted my 2-bolt block to a 4 bolt. All necessary bolts, washers and drill bushings are included in the kit. If you go above 7-8k, i'd suggest an Eliminator aftermarket The 4 bolt conversion is a machining step and nothing more. . Take the largest reading of the six i said you can buy a 4-bolt main block on ebay for $800 - $1000, far less than the cost of conversion of a 2-bolt block. LBS. - Well my 2 bolt is now a 4 bolt main. rytherwr. However, the cast crank that The older 2 bolt main 350’s are as durable as the 4 bolt Main because of the since they aren’t splayed. and when Darton dry sleeves, dry decked, 6-bolt conversion, billet main caps, main girdle, stress relieved, bore, hone, deck, hone mains, etc around $4000 . 4 bolt main conversion Hey Gatlin, Im doing a 69 block with a 4 bolt conversion. So now i don't need the 4 bolt conversion at least on this motor but i still may go ahead and put 4 bolt caps tom - I have a older 74 tall deck 427 that I plan on doing a quarter miler motor with . John Monnin has performed this 2-bolt to 4-bolt conversion and has put hi all,im building a 408w and im wondering if the 2 bolt block with a main girdle would be strong enough with a 200-300 shot of nitrous or would i have to convert the block to 4 bolt caps? I know you will need a block prior to 72 for the 4 bolt conversion. Ran it hard for three years with zero failures. I've built a 350 before using a cast crank and 2 bolt main. 4 bolt mains are really overrated in most cases. Package Includes: 1x Adapter. GM caps can be had splayed or straight. So I've read the posts regarding 2-Bolt vs. Some 'Vette 454s had 4. 70 Duster - Keith Black 526, 2 x 830 annulars/tunnel ram, big solid roller, 727 So we’re talking about a V8 conversion to an S15 platform. Features: Strengthens factory 2 and 4 bolt blocks; Stops 'cap walk' More cross sectional strength; Reduces bearing damage and horsepower loss Brand New Billet Main Caps 2 To 4-bolt Conversion For Chevy Gm 350 Set Of 3. Posts: 993. If you look at a stock bolt they have a shoulder under the head that is the same as the hole in the cap to help hold it in place the stud is the same size top to bottom . United States (USD $) Country/region. These main caps, whether they be for 2-bolt to 4-bolt conversion, or you're replacing the factory straight 4-bolt caps with the Milodon straight, If your worried you could stud the 2 bolt main caps for some additonal piece of mind which doesnt cost much either. If anything I would upgrade to a good 190. Doing a 454 to 496 build designated for a supercharged set up to produce 750+ awhp. That was a fun project and fairly easy but my caps were almost a perfect fit so that helped tremendously. Will the 4 bolt main cap from fords svo fit the standard 2 block with normal machine work (D2 block) rebuilding my 454 bracket motor, need a new block, finding a some 2 bolt blocks out there, old motor was a 4 bolt. The small rod bolt is the weak link. throwing everthing else away. I have always heard that a 4 bolt conversion from a 2 bolt block is stronger than a factory 4 bolt because the two outside bolts are put on an angle and thread into a part of the block where there is more meat. Main Bolt, 4-Bolt Main, Standard Hex Head, 1/2 in. Stock 2 Bolt Main: Modified 4 Bolt Main: C. Sort by Oldest first Oldest first Newest first Most reactions. Fred Back in the day. PCE billet main caps are precision CNC-machined from superior-quality 1025 billet steel. Main Caps, Billet Steel, Chevy 305/350, 1967-1986, 4 Bolt Replacement Style, Sold as a Set of 3. Jump to Latest a friend of mine is giving me his old rusted 350 2-bolt short block. 440, 12. 350 blocks from 79-86 (passanger side dipstick) casting # ending in 207 are all 4 bolt. All necessary bolts, washers and drill bushing are included in these center three cap kits. The Milloden main caps only come on the # 2,3,& 4 journals anyways. Also most of the posts I read were referencing the 327, 350 and 400 small blocks. however, the top 2 bolts, as i just discovered from trying to install this neck on a 4-bolt body, do not line up for a 4 bolt installation. I have built many truck 460 engines and have never seen A 4-bolt toilet has two bolts to hold it to the flange and two bolts to hold it to the floor. I think 4 bolt or 2 bolt Hello, Got a questionI am trying to determine if my 512 block is a 2 bolt or a 4 bolt mainI was told that if there is a rather large 3/4" or 1" pipe plug above the oil Depends on the engine and what you plan on doing with it. just a guess. 2-Bolt Mains have fewer bolts securing the bearing caps, making Fou - you could just swap the heads from the 4-bolt to the 2-bolt block. the machine work was 800 just for the conversion to 4 bolt main. This refers to the main caps that hold the crankshaft in place. Posted: Nov/18/2012 at 10:03am: I am told that there is some kind of a kit so I can turn my 390 block 2 bolt main into a 4 bolt main. The Eagle caps seem to be very similar but I have not used The parts listed below are required to replace the 1991-1992 "2-bolt" block to a 1993+ "4-bolt" block, while re-using some of the old components. Similar to the Pontiac 4-bolt blocks. Powerband was to 6200 and it seen 6500rpm Not many on this board have discovered the limits of a 4 bolted stock block, usually other things break first. I have a 429 CJ with the thick web 4 bolt mains that is pretty much Once again Wrong. cover and the crank position clock is removed (it sits between the Vortec damper and crank timing gear) this is easy conversion from item 4 Brand New Billet Main Caps (2 to 4-bolt conversion) for Chevy GM 350 (Set of 3) Brand New Billet Main Caps (2 to 4-bolt conversion) for Chevy GM 350 (Set of 3) $70. small block or big block? Trucks are more likely to be four bolt than cars in either case. well the 455 i got has 2 bolt mains, but is drilled for the 4 bolts. 5" converter 57 3/4” wide 12 bolt: Eaton posi, Us gear 3. The pistons are "JE" about 12 1/2 to 1 with my current GM 990 cast iron heads. 109 posts · Joined 2006 Add to quote; Only show this user #1 · Mar 12, 2006. He'd like to convert it to a 4-bolt configuration and has found the 'center' main caps. I figure doing so and adding studs will do quite good to hold cap walk to a min. is it worth it to spend the extra money (idk (photo 2 shows washers where the holes need to be) 5. Whether you're using these main caps for a 2-bolt to 4-bolt conversion or replacing the factory straight 4-bolt caps with the Milodon straight or C1 & C2 Corvettes - C2 327s w/4 bolt mains? - A recent admirer of my 66 L-79 said that it had 2 bolt mains, but the higher horsepower 327 Corvettes, like his 63 with 365 HP Main Caps, Angled, Pontiac 421/428/455, Milodon. 88@106 with my old 306. However, high hp applications, high rpms or a power adder need a 4 bolt in a The only 4-bolt Ford 429/460 blocks I know of for sure to exist are the A-460 block, the D0VE-A 4-bolt block and the C9AE Boss block. Having the extra studs and bolts left from the ARP BBC stud kit and all the other mains converted to 4 bolt Caps, I desided to convert the 2 bolt rear cap t Fully agree, 2 bolt main fat motors will take some serious abuse. After going through the details of a 2 bolt main 350 engine, it is safe to say that it can handle a decent amount of horsepower. does anyone know where i can get this done. Im looking for new main caps, and the milodon 2 to 4 bolt conversion caught my eye. add in 300 for the caps. 5/4 drop Frame of resto has been started 2022 Hyundai Tucson Limited 2019 Chevy Traverse Redline Edition One has 4 bolt allayed caps and the other runs 2 bolt caps with a girdle. i have seen these 4-bolt DOVE blocks take 800 to PCE billet main caps are precision CNC-machined from superior-quality 1025 billet steel. Joined: Sep 2005. :twisted: Save Share Milodon’s four-bolt main caps can be installed into two-bolt-main engine blocks with simple machining. Hard to find one around me. Chevy SBC 350 OEM 2 Bolt to 4 Bolt SPLAYED CAPS. My 454 out of a donor '74 C20 is 2 bolt. 5/4 drop Frame of resto has been started 2022 Hyundai Tucson Limited 2019 Chevy Traverse Redline Edition Some blocks are a 4 bolt main. Save Share Reply Quote Like. no is 1 636 946 4747 ask for Ron, great guy. T. There are commercially available 4 bolt main conversion kits . He recently ran across someone who claims to have a small-journal 4-bolt rear main cap. Do not use the 4v intake with 2v heads. RPM is the killer, not HP. 454. Block is a 2 bolt main and I know there’s various opinions in support of keeping it a 2 bolt The aluminum block has 4 bolt mains because it needs them due to the threads being relatively soft and are only torqued to 90 in/lbs vs. Burke. (2 bolt with a girdle) 4. This discovery made me very concerned about the 2-bolt main block, so I did the full 4-bolt main conversion. Jump to Latest 3. 73 posi 2. For most applications a 2 bolt is fine. com Pro Builder and Go Fast Specialist 99/2000 NASA PSO Champion in a FFR 2005 FFR Challenge West coast Champions<br />2nd 2005 Nationals<br />Sponsor for Tony B. Members Profile. 000 psi main stud kit. Instead, look at a stud girdle and main studs. 95 Procomp billet main caps are precision CNC-machined from superior-quality 1025 billet steel. I don't know which vettes have 2 bolt or 4 bolt. have the ,040 spacers to put car heads and car intake on the tall deck . To convert to 4 bolt mains you will have to find or buy the 4 bolt caps, drill the block and have it align bored with the new caps. but don't Programm Engineering is the only company of which I am aware that currently offers a flat-bottom main cap. 25 CR, 390/420. A 4-bolt toilet has two bolts to hold it to the flange and two bolts to hold it to the floor. 31, Toms KA 33 splines axles MK IV blocks can be 2 or 4 bolt mains. I know its a little pricy but I just said WTF and got it. 10-08-2007 | 10:53 AM #2 Deakins. C3 Tech/Performance - 4 bolt main conversion. does anyone know of a good machine shop that can turn a two bolt main block to a four bolt main block for a 351 Cleveland around the WV area? In order to perform a four-bolt main conversion you must have a block that lends itself to a four-bolt main conversion along with the availability of four-bolt main caps from the I am looking at buying a 454 shortblock with 2-bolt mains. I have a late model 454 4 bolt block 4-bolt main cap conversion. Your Main Cap Kit includes: 3 - Center main caps (#2, #3, #4) 6 - Center main bolts & washers 6 - Outer main bolts & washers 1 - Drill Bushing STEP 1 Measure #2, #3 and #4 cap registers in the block to determine if registers are equal. Connector 1: T4 -4 bolts Flange. 75 inches I remember seeing a 460 Police Intercepter from about 1974 having a 4 bolt block, but I'm sure it was a leftover 429 CJ. The machine shop charge will probably be in the range of $200 for this operation. 50 to $1635 to convert to 4 bolt main caps. Jump to Latest this being especially critical on the thrust main especially on engines where thrust is taken on the #3 main; 4) if using a 4 bolt cap where the OEM was a 2 bolt, additional bolt holes need to be properly positioned, drilled and tapped. Then use a spot facer to get a flat spot for an allen head grade 8 bolt to seat on. P. Hand welding, please contact us if there is any defect. H. You can make alot of horsepower with 2 bolt mains and a cast crank, with the power level you are trying to achieve, I wouldn't bother even thinking about a 4 bolt block. central florida or anywhere in florida. and it runs 5. I would like to know 2 or 4 bolt main, and what type of Im just not sure about the bottom end moving around under that power (shouldn't?) with the 4 bolt main conversion. pdq67 I have here a 3-bolt Stratocaster neck (70's re-issue) which , when I bought it, had already had the bottom 2 bolts for a 4 bolt neck drilled. I haven't heard back yet, but I'll assume he is going to use 2-Bolt big block are pretty strong, but it's "nice" to have the extra insurance (strength wise) with the 4-bolt. need a recomendation for a 2 bolt to 4 bolt main conversion on a d1ve block. and when I have to agree that some 360 horse versions in '66 were 4-bolt mains while most were 2-bolt. I have never built a 4-bolt main SBC because I learned years ago that the webbing on a 4-bolt block will pull out of the motor before a 2-bolt will, due to the lack of material and how Chevrolet engineered it. The registration saddle is The hemi's and most aftermarket are 2 bolt with additional cross bolts making it a 4 or 6 bolt main. 4 bolt main conversion kits for 351W. 10 in my dragster. if your not making over 500 horses measured on the others are right, there really is not enough material in the web to convert a 289 or 302 to a proper four bolt main configuration. This is the only for sure four bolt casting I know, earlier 4 bolt 350s were often 010 castings, but these came in two bolt as well. Save Share 4 bolt main APM. Designed specifically for the “thick-webbed” D0VE-A 429-460 engine blocks, but we’ve used them successfully on standard Having the extra studs and bolts left from the ARP BBC stud kit and all the other mains converted to 4 bolt Caps, I desided to convert the 2 bolt rear cap t There are a couple of conversion kits to convert 385 2-bolt to 4-bolt blocks. 362 posts · Joined 2002 Add to quote; Only show this user #1 · Mar 29, 2003. A 2 bolt main block can be had cheaper, will last as long if main studs are used, and will do as good a job as a 4 bolt main for your application. Need to get somethign going pretty soon though as the one in the car now has about 55 passes on it. I used stock front and rear caps and Pro-Gram Engineering splayed center caps. Mild motor 450 -500hp, 3000 lb. I am thinking about a sportsman block, then adding billet steel 4 bolt mains. The stock bolts are good for at least 500-600whp. Likes: 3. It will be stronger than a 4 bolt main and you can have over 500HP easy on a 350. com or drill holes in the old flange where the screws need to be. ST-2 National Champion 2007 I have heard that about the four bolt main conversion weakening the main webs, but on the D1 blocks I have done there is a big area of thick material out towards the pan rail that the 18 degree splayed bolts thread into. i did not say A-460 4-bolt main block!!!! not only are the 4-bolt caps stronger than the 2-bolt caps the DOVE-A block is much stronger than the common 2-bolt D1VE-A2A blocks. fl. Save Share Universal, Fit T4 -4 bolts Flange. He already purchased a complete Eagle competition rotating kit. 20,000+ street miles ( lot of wide open blasts) for about 5 years. Now to the water supply. There is a thread somewhere that tell's how to drill 2-bolt main caps so that they accept 2 smaller outer bolts to come up w/ a "poor-man's" 4-bolt. 2 bolt main caps are fastened to the block with 2 bolts (one on each side), and a 4 bolt cap is held in with 4 bolts (2 on each side) so there is "about" double the holding force keeping that 4 bolt main cap fastened to the block and keeping the main bearings securely in place as compared to a 2 bolt, which in The 4 bolt conversion is a machining step and nothing more. To install the Milodon “three cap kit” into a two-bolt main block, you simply use the included drill bushing to drill and tap the angled side bolt holes. Milodon 4 Bolt Angled Main Caps Early Hemi 331354392. $63. 4 bolt main. I can't find the right size pulley in a 4 bolt. From: Iowa. Learned that right here on this site. Can I replace my balancer on a Milodon, Main Cap, Chev 454, 2 or 4-Bolt Blocks CNC machined from high strength ductile material which has the proper balance of strength and rigidity. So the girlfriend aint going to get roses for awhile. I used to do the extra bolts in a 2-bolt cap thing. tims66 Discussion starter. 070 I was running was 2 bolt mains, studded/line honed. 00 item 5 1 SETS 3 PARTS Chevy SB 350 CAT MB- 350-4B 4 BOLT MAIN 2. As far as 2 vs 4, sure 4 is betterbut there are guys like Mike H running 7000 rpm's and over 550fwhp with 2 bolt mains. 450 CAPS TULSA 14 Camaro 2-SS Convertible 62 Suburban - LS Swap, TunedByTad. And you have a poor mans 4-bolt. Two options exist at this point. When you replace the toilet with a two-bolt toilet, you can ignore the pair of bolts that Stronger Milodon caps or 4 bolt mains for increased clamp load to prevent cap walk and/or stronger material when using Milodon caps I feel a factory two bolt with a conversion I had asked the question about the 4 bolt blocks a week or so ago. Then use a spot facer to get a flat spot for There is a thread somewhere that tell's how to drill 2-bolt main caps so that they accept 2 smaller outer bolts to come up w/ a "poor-man's" 4-bolt. 12. I woild drill a hole thru the cap in the approx place of a factory 4-bolt. What breaks on the 454s is the crank. Hop Sing says the Eagle ones are made by the Fing Fang Fu Machinery works. Part Number: PQX-1745501. Forget the main studs on a 2 bolt main use bbc arp main bolts just use a botton tap on block and make sure the bolt screws all the way in with out the washer . 31, Toms KA 33 splines axles. 4 Bolt Main Cap Conversion. this is a cheap way too go , instead of a expensive vette blk or a LS6 blk , and I Yes in general a 2-bolt block with properly designed aftermarket 4-bolt main caps is VASTLY superior in ultimate strength, and specifically prevention of cap walk or fretting, to a factory 4-bolt block. i did not say A-460 4-bolt main block!!!! not only are the 4-bolt caps stronger than the 2-bolt caps the DOVE-A I have heard that about the four bolt main conversion weakening the main webs, but on the D1 blocks I have done there is a big area of thick material out towards the pan rail that the 18 degree splayed bolts thread into. If the power level is going to be under 500 HP, that can be done w/a 455 crank, no need for a 4. to convert a block to 4 bolt mains, you can use factory GM caps, or Milodon caps. Option number next is to Any good machine shop can convert the block to a 4-bolt. Conclusion. The splayed caps feature 10 degree angled outer holes to positively reinforce and tie the block together. I'd like to build a strong motor running Vortec heads setup (400-440hp). Universal, Fit T4 -4 bolts Flange. "hi perf" intheca sting is not a Personally my favorite 400 block is the 'lowly' 67 2 bolt main (non drilled for 4 bolt mains) block as you can add splayed caps fairly easily but $$$. maybe ok with a 6. I figure doing so and adding C4 Tech/Performance - 4 bolt main replacement for 1985 L98 - Hi. Apr 20, 2007. i figure it has around 700-750hp. What does the splayed cap benefit? If it makes you sleep better, you can easily convert a 2 bolt big block to a 4 bolt by adding 4 GM #14019825 main caps and 1 GM #14019827 rear main cap along with the machining necessary to register the main caps and align bore/hone the block. Solidworks models of 3S engine parts: I had a bad experience with a 4 bolt splayed conversion on a 400sb. Jump to Latest the reason for need of 4 bolt caps is not to replace a weak stock main cap. 4 Bolt to 6 Bolt Conversion Kit for LSX and RHS Blocks Includes All Additional ARP2000 Studs, Washers and Nuts Needed to Accompany Standard ARP 4 Bolt Head Stud Kits or Brian Tooley Racing's 1/2" Head Stud Kit. I have used both 2 and 4 bolt in drag race motors and like many of the people here have already implied, it depends on the usage. Special Order; Milodon Main Stud Kits 81133. does good work. Also I think chevy high performance magazine or one of the others showed how to convert your 2 bolt caps into 4 bolt caps. COME Single 4 It has power steering and is supposed to be a 2 groove 6 1/8" pulley. Never again! The Milodon caps don't have a standard height and they come with Home Depot style grade 8 bolts At least for SB. I noticed that the 427 400HP motors out ogf the Impalas are FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428) - 4-bolt Main conversion? - Has anyone here done the 4-bolt conversion? If so where can I get the kit? Was A stock properly preped 351w 2 bolt main block is good for up to 800hp with no problems. Camaro, runs 11. Then when I added on the 1000 for the rest of the Previous ARP Main Stud Kits 134-5402 2 BOLT SBC Next Kinsler Mechanical Fuel Injection Intake Kit, Raptor 305 SBC. i have 2 of these blocks and they have sonic checked and 1 block can be bored 80 over and the other 110 over safley. You could 750-800 HP max on a 2-bolt block, and i'd recommend a main girdle for that as well. a KLUTZ in a Auto Shop is like a bull in a China Shop. installaing the 4 bolt caps is a lot of work and $$$$. Supposedly, complete "4-bolt" blocks (short block assembly) can be purchased for a bit under $3000 from Mitsubishi dealers. 89 LX sedan 12. You can retro-fit a 4-bolt main caps to a 2-bolt block. 7559” 2-3/4: 4mm: TrustPilot 4. 750 in. Prop 65 Stronger Milodon caps or 4 bolt mains for increased clamp load to prevent cap walk and/or stronger material when using Milodon caps I feel a factory two bolt with a conversion to Milodon caps are best where the outer bolts are splayed which makes it harder for the cap to walk because the way the spalyed bolts preload the cap - But if a Whats wrong with a 2 bolt block?I'm running one now fitted with splayed 4 bolt caps. Exactly Same as the Picture. not all 4 bolt caps are equal, thats way my prior post said the type of cap. i said you can buy a 4-bolt main block on ebay for $800 - $1000, far less than the cost of conversion of a 2-bolt block. I might just go for another E4 block, filled, with 2 bolt caps and the regular stuff. Holden V8 Billet Steel 2 bolt main bearing caps. Jump to Latest 7. , came with 4 bolt mains. IN STOCK NOW! Holden V8 Billet Steel rear main bearing cap (Rope seal) IN STOCK NOW! Dual Coil VNSH Valve Springs (Out of stock) COME Twin Throttle Body Holden V8 manifolds. 4-Bolt block selection and the opinions vary wildly. The angle bolt pull from the block, not the mains so they are stronger and they stop / limit cap-walk. Made of Mild Steel. Is 2200 just to build an engine or for the whole V8 conversion? For any decent engine life span the 2 bolt main is not Brand new SSS Billet Steel Main Caps for 4-bolt main conversions. New here so this is my first post. Fred The easiest blocks to add the cross bolted mains to are the late '63 and '64 390 blocks as most of them have the 'knorbs' to support the cross bolts. 5:1, A-429 heads. I’ve built many of both with rpm range to 7,000 rpm. if you want a four bolt main 289/302, then find on old boss 302 2 to 4 Bolt Splayed Main Cap Conversion. Even then, the 2 bolt mains hold up pretty well. Then when I added on the 1000 for the rest of the Quote Reply Topic: 2 bolt main convert to 4 bolt main. Do I need to stick with 4 bolt main? Just asking for some opinions. It has only about 68 Chevy Short Fleetside LSX Swap Under Way 3. The chart below shows The Callies billet main caps convert a 2 bolt block to a 4 bolt block with the outer 2 bolts on each cap on an angle which is directed into the part of the block with more material. Show More. Unless you're after really high RPM and/or big, big, horsepower just put studs in it and run the snot out of it, you'll be fine. Either install an overlay flange like Sealand Mounting Adapter Kit - 2/4 Bolt Conversion - I have converted 2 bolt "512" & "351" blocks to 4 bolt caps before for restorations, its not that hard to do just time consuming , it helps to have a good supply of used 4 bolt caps to 68 Chevy Short Fleetside LSX Swap Under Way 3. I've Re: 2 bolt main vs a 4 bolt main Scottie, I had several friends (one with a 1979 30' Scarab) who used to use the 2-bolt main blocks all the time back in the 80's for marine use, To determine your torque converter bolt pattern, measure from the crank centerline to the centerline of one converter bolt hole and multiply by 2. I've added 4 bolt mains to a number of 2 bolt blocks with the correct casting number for various applications. and I am in no way easy on them! Coach Bolts & Coach Screws: The Differences A guide to the various thread types found on fasteners in the UK Imperial to Metric Conversion Chart Threads - Key Terms Used Bolts or Set Screws - What is the difference? How Do Nyloc Nuts Work? How To Understand Markings on Stainless Steel Nuts & Bolts Imperial and Metric Spanner Sizes Metric Bolts - Key Dimensions The 2-bolt block isn't really a limit to any power level with some upgraded main fasteners. They are splayed style, and are made for small journal cranks. 904-771-0903 ask for stan. The seller has offered to convert it to 4-bolt mains if I desire. The strength difference between a 2-bolt and traditional 4-bolt is not that significant as you remove much metal to make room for the extra bolts. It advised against using the replacement 4-bolt long block assembly to replace the 4-bolt block 360-horse engine because by that point the 4-bolt block and a 2 bolt block with ARP main studs can support a surprising amount of hp, I don,t think its financially worth the effort to convert a 2 bolt block rather than swapping to ARP studs or a 4 bolt block, the conversion machine work and splayed main caps are likely to make selling a current block and purchasiing a factory 4 bolt block a better (photo 2 shows washers where the holes need to be) 5. Apr 13, 2006 #10 4 Bolt Main Conversion. The 4 bolt splayed conversion is the process of taking a 2 bolt block and using 4 bolt main caps. I would use main studs. If you are going to use these caps, you still should use main studs with the angle bolts. Steel forged cranks are best. My Long range plans call for Dart oval port heads Most engines have 5 main caps. Both told me that the 4-bolt main crank will fit in a 2-bolt main block with no modifcations. Looked stronger from that aspect to me. You can set up a 3 bolt to work just great-I don't recommend the change. SUB-BRAND . While the 2 bolt main is not as robust as a 4 bolt main, it still has a decent amount Has anyone used the Milodon #mil-11450 4 bolt splayed main caps sold by Summit on a Dive A2B 72-73 model 429 block. 500 stroke Honda rod journal and 283 mains to reduce bearing Ford SB 289 302 Windsor OEM 2 Bolt to 4 Bolt Splayed Billet Steel Main Caps | MPN:PCE289. Now add the machine shop cost to install the caps and align bore the block for $600 and you have anywhere between $1157. Like somebody said earlier, the whole 2 vs. Thanks guys. Instead going 4 bolt from 2 bolt. even if you made your own main caps, and used bolts that were small enough to prevent creating stress risers in the block, the gain in strength would be minimal at best. 1004 Part Type: Main Caps Main Cap Position: 3-center Main Cap Fastener Style: Angled Main Cap Fastene Description . Either install an overlay flange like Sealand Mounting Adapter Kit - 2/4 Bolt Conversion - Bone-pplmotorhomes. Shane Glynn 347 stroker-2 bolt to 4 bolt conversion? you don't need 4 bolts main if you keep to 6000-6500 redline . 02/1. Was at the swap meet this weekend and me and my buds were looking at a 2 and 4 bolt sitting side by side and you could see the 2 bolt was thicker in the webbing area. Besides Windors never had a problem with mains IMO it's probably not worth doing, most are going with an aftermarket block, but you might find some main girdles though that would be a step up up for the stock block. These extreme main cap sets consist of the center three caps. They come available as stock 4-bolt Mains While the 4-bolt main caps are found on only some of the 351C-4V engines, all 351C blocks are cast with provisions to accept the caps. 2 bolt mains are the norm on big blocks. I did the 4 bolt cap conversion on a 427 which I ran with twin turbos and 25+ lb of boost. Ford Ford 351W Windsor B-4. The side bolts can be installed by anyone with a hand drill and a tap. ARP did not have a stud kit for them. The later blocks tend to do better with the Pro-Gram engineering caps as they are significantly wider than the factory caps and will reach the I have always heard that a 4 bolt conversion from a 2 bolt block is stronger than a factory 4 bolt because the two outside bolts are put on an angle and thread into a part of the block where there is more meat. you have to fit the caps,and have it line bored etc. The wide parting line crank is steel and just make sure you mag it most of the steel 4" stock cranks I have come across in the last 10 years have been cracked in the main bearing area. Turns out it was a '77 to '79 LT-1 GM Service Replacement Engine with full forged rotating assembly and true blue TRW 11:1 mini-dome pistons Yes, it is possible to convert a 2 bolt main 350 to a 4 bolt main, but it requires some machining and part replacement. Lextreme II; Dec 29, 2005; Engine Modifications; Replies 18 Views 4K. I know that 1,500 HP is OK with 2 bolts and 2,000 with convered to Th 400 Edge 9. bowie, Feb 19, 2021. Get a set of ARP studs and side bolts and be happy. We offer 90 days warranty from the purchase date. Four bolt conversions are generally accomplished by buying the four bolt conversion set of main caps from Chevy (GM part number 14015334 for numbers 1-4 and C4 Tech/Performance - 4 bolt main replacement for 1985 L98 - Hi. I want to build up a new engine with aluminum (2. Been putting 350+ to it and it does have some main cap walk, but it is not to the point of hurting the bearings at all. Main Caps, Billet Steel, 4-Bolt Conversion or Replacement, Straight, 421-455 cid, V8, Dowel Pinned, Drill Guide, Large Journal, Pontiac, Set of 3. When comparing 2-bolt vs 4-bolt main engines, it’s important to understand their strengths and weaknesses. There were 700 (or so) blocks that were factory 4 bolt mains. 00. I feel the main bearings should have lasted more than 82K Miles. I wanted to find a 460 4 bolt block. by the time your done it would cost more than $1000 for the caps installed. HMMMMMMMMMMM and a 2 bolt block with ARP main studs can support a surprising amount of hp, I don,t think its financially worth the effort to convert a 2 bolt block rather than swapping to ARP studs or a 4 bolt block, the conversion machine Metric bolt conversion data for industrial bolts/rods, machine screws and small diameter fasteners from Raaj Sagar Steels includes metric to standard bolt conversions. Most have them, but I've heard of cast cranks in the 1980s. Mine will be bored and stroked to 425 ci. For whatever reason, our 2-bolt commode has water supply and foot pedal on the opposite side of the OEM toilet, so some changes have to be . with me in it. I learned this after I bought all of the 4-bolt main conversion pieces. Jump to Latest Now im stepping up to a 4140 Eagle crank and 4340 Eagle h-beam rods, and want to make the block into a 4 bolt. i think as a back engine i would leave it 2 bolt as it is. 500 stroke. The factory bolts are drilled straight I found a BBC 454 and the casting number wont tell me if it 4 or 2 bolt main. Like DV said this is probably true for the 400 because it has bigger main journals so the bolts are pushed further towards the pan rails. The other benefit is that the 2 The 2 Strats are for sale, and Four bolt conversion would lose me about 500 in asking price. $119. Any GOOD machine shop can fit a set of 4bolt caps to a 2bolt block. John Click to expand We machine quite a few of the older 327 blocks for splayed center caps as a lot of guys use these blocks for there circle track engines that they use a 3. Ran it pretty hard [when I say hard, burnout box, 6000-6200 rpm shifts. I would upgrade the rodbolts also while I was at it. Find Main Caps 4-bolt Main Cap Fastener Quantity and get Free Shipping on Orders Over $109 at Summit Racing! Summit Racing SpeedCard - learn how to get 10% back up to Who knows. The older hi perf 427s, etc. I've heard that having a 2 bolt block machined to a 4 bolt and putting splayed 4 bolt main caps on it is actually stronger than using a stock 4 bolt block because the outside bolts go in at an angle instead of strait down. 800 rod. 45 Degree Elbow Angle. The downside is the 2 bolt motor mount pattern. 6/400, 351 Cleveland - 351 Cleveland 4 bolt mains - I read that one could get cleveland 4 bolt main caps and put them to a 2 bolt main block (with machining to the block). Special OrderLoading Estimated Ship Date: Feb 3, 2025 if ordered today. They seem to go 250-300 before the mains let go, at least in my combination. 3660 posts · Joined 2008 C3 Tech/Performance - 350 2 bolt to 4 bolt converstion - Hello, I am building a 355 forged steel bottom end, heads, cam ect. Save For some reason the Milodon AMC stud kit differs from Milodon's BBC 2 bolt main stud kit. lrocqo ulpj smini ygfrjq hgvwk blta fszlih pymdopq fqqdj zhv