3/9/2024 0 Comments 327 flat top pistons![]() Internal combustion engineering has come a long way to achieve these higher static compression ratios and still operate on 91-93 octane fuel. We won’t get into all the details as to why but suffice to say that those older combustion chambers were not designed to accommodate that kind of compression. Having said that, you can’t run that much compression on a small block Chevy using older, ‘70s vintage iron heads. The LT1is designed to operate with premium fuel but comes from the factory with a true 11:1 static compression ratio. There’s a reason that all the latest generation LS engines and especially the new gasoline direct injection (GDI) LT1 Corvette engine have higher compression ratios. Assuming that the added compression is not excessive, adding compression is the best way to improve power while also improving efficiency. Jeff Smith: Raising the compression ratio is an excellent idea for several reasons. I’m thinking a little extra compression wouldn’t’ hurt but I can’t afford a set of aluminum heads. The engine runs fine on the cheap 87-octane stuff and doesn’t ping at all. ![]() The other parts are an Edelbrock Performer intake, a 600 cfm Holley carb, and cast iron exhaust manifolds. The previous owner said it was rebuilt and has a cam but he couldn’t remember the specs. I don’t know much about the engine because it came in the car. Is there a cheap way to increase compression on my small block Chevy? I have a 350 small block with iron heads. ![]()
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