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Do GM 840 rectangle port heads lose tq on a 396
WebJan 6, 2012 · The 396-427 crank will make it a 427+.030 with the correct pistons. You will have to use closed chamber piston. If you use a factory 427 closed chamber forged piston it will hit on the head around the exhaust side of the piston. As these pistons were designed for the rect port heads that were more open in that area. WebAug 29, 2024 · But for those of you who don’t know, porting and polishing your heads is beneficial for power and efficiency of the engine. In a lot of cases, because of the increased CFM of the heads, as much as 30 horsepower is typical with good port work. Just remember, it doesn’t come for free. This is a slow-moving job—some people will spend up to ... dc65 refurbished
port size vs torque - Gen I & II Chevy V8 Tech Board - HybridZ
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