The Block Casting Number designates veries information of the block such as the displacement, the year of production, 2 or 4 bolt main, and also vehicle application. Chevrolet Big Block Casting Number Location. A 2-bolt main engine is better for power below 450 hp. If you are building for higher power, you will need a 4-bolt main. The higher the power you need to draw from an engine, the higher the load on the main caps. More bolts on the main caps are likely to hold on for long at higher output power and torque.. The last 454 I built was 4 bolt but I am wondering if it is worth the $2000 savings to go 2 bolt or if the reduced strength for a 450-500HP motor will be worth the extra dollars spent. So there ya go - What do you think? And "Hey" is just generic to everyone - hope I didn't offend anyone with it. 67 Yenko Tribute - 427/4SPD/Bolero Red. The Block Casting Number designates veries information of the block such as the displacement, the year of production, 2 or 4 bolt main, and also vehicle application. Chevrolet Big Block Casting Number Location. Jan 18, 2014 · Carbureted Intake Manifolds (51) Camshaft and Lifter Kits (48) Brake Pads (44) Headers (44) Rocker Arms (44) Editor’s Note: This series counts down the Top 10 engines of all time— see how the voting was done by reading our initial post. SOURCE: EngineFacts.com. Tags: Chevrolet 454, Chevrolet big block, Chevy 454, Top 10 Engines. Tweet.. For the most part 2 bolts are fine. 4 bolts may be better if your really twisting the motor (high rpms)....point is there are plenty of powerful 2 bolts running around. You can also check out these posts: https://www.chevytalk.org/threads/showflat.php?Cat=0&Number=1378057&an=0&page=1#1378057 IrideVOR Member Posts: 6 Loc: Utah Reg: 10-15-05. As for the 454 itself, the 2 bolt main blocks are considered a low performance block. If the available 454 block is a 4 bolt main, and your car is NOT a numbers matching, I'd consider setting the block up to 427ci. configuration and match to the stock '68 engine (coolness rating). If you are looking for raw power, just build the 454. JAT D. Apr 11, 2005 · There are two different schools of thought when it comes to "2 bolt vs 4 bolt" mains. On a 350 (aka 383), yes, go 4 bolt. If you ever do build a 400 sbc, then I honestly have to say go for 2 bolt. On a 400, the 4-bolts are weaker (argument comes in here). Just food for thought in the future. For your current project, however, I also say go with .... Carbureted Intake Manifolds (51) Camshaft and Lifter Kits (48) Brake Pads (44) Headers (44) Rocker Arms (44) Editor's Note: This series counts down the Top 10 engines of all time— see how the voting was done by reading our initial post. SOURCE: EngineFacts.com. Tags: Chevrolet 454, Chevrolet big block, Chevy 454, Top 10 Engines. Tweet. Jan 18, 2014 · Carbureted Intake Manifolds (51) Camshaft and Lifter Kits (48) Brake Pads (44) Headers (44) Rocker Arms (44) Editor’s Note: This series counts down the Top 10 engines of all time— see how the voting was done by reading our initial post. SOURCE: EngineFacts.com. Tags: Chevrolet 454, Chevrolet big block, Chevy 454, Top 10 Engines. Tweet.. The caps that hold the crank shaft in the block are held down with bolts. 2 bolts each is a 2 bold main. 4 bolts is a 4 bolt main. The splayed main caps for a 2 bolt are stronger than a 4 bolt because the bolts go in at different angles to help keep the cap from walking. Felber would be a good person to ask for sure about an airboat, but I have seen 700 hp 2 bolts turn 7000 rpms and last several seasons in a dragcar. N NotAGuide Well-known member Apr 4, 2010 #6 roberti53 said:. I'm picking up a 60K mile 454 with a TH475 (straight cut gears 400) in a few weeks from a colleague. It came out of his late 70s Airstream motorhome. Motor is also marked Hi-perf Pass, but that is meaningless. Many BBC were simply marked Pass, the Hi-perf pass does not automatically mean it'll be a 4 bolt, many are 2 bolts. Main Journal Type. Chevy 454 (27) Chevy LS (21) Chevy 350 (13) Chevy 400 (11) Ford 302 Windsor (8) Ford 351 Cleveland (6) Honda B-series (4) Chevy 8.1 Vortec (1) ... 4-bolt Mains, 4.000 in. Diameter Bore, 2-piece Rear Main Seal, Chevy, Small Block, Each. Part Number: DRT-31161112. Not Yet Reviewed. Estimated Ship Date: Nov 7, 2022 if ordered. There are two different schools of thought when it comes to "2 bolt vs 4 bolt" mains. On a 350 (aka 383), yes, go 4 bolt. If you ever do build a 400 sbc, then I honestly have to say go for 2 bolt. On a 400, the 4-bolts are weaker (argument comes in here). Just food for thought in the future. For your current project, however, I also say go with. "/> 2 bolt vs 4 bolt main 454
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