Thread: raise compression

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Have a 454 40 over lun 548 cam 850 proform. stock 119 cc heads will a set of 96cc heads due the trick? If so anybody have a pair? Thanks

If all you're looking to do is raise compression, sure the small closed chamber heads will work, but they don't flow well at all... valves are small and intake will be shrouded no matter how much you work the chamber.

There may be other opinions but I think 9 times out of 10 you'd be better off with the heads you've got (unless they're peanut ports?) give up a little compression for a lot more flow...

two cents,

Chris

Originally Posted by WHYLEE3@COMCAST

Have a 454 40 over lun 548 cam 850 proform. stock 119 cc heads will a set of 96cc heads due the trick? If so anybody have a pair? Thanks

Not slamming you, but did you think this would be enough info to get responses? Need to know cam specs, piston specs, current compression ratio, have current heads been milled, block been deck at all etc.

This post sounds familiar.

Are you the guy that typed in the wrong gasket thickness (.0025 instead of .025) and miscalculated your static CR???

Originally Posted by 30-A Rider

Not slamming you, but did you think this would be enough info to get responses? Need to know cam specs, piston specs, current compression ratio, have current heads been milled, block been deck at all etc.

He's gotten three so far...four including this one ...kidding

Agreed, you must always ask your self not only "will this achieve my goal?" (raise compression) but also "what are the factors I must consider in reaching my goal?"
You will raise compression with a smaller chamber.
You MIGHT have a problem if you have domed pistons designed for OPEN chambered heads.
You MIGHT have a problem with detonation (correct me if I have the wrong term in there) if your compression winds up being too high. Is it a pump gas motor?
I agree with Skids 100% but more info will yield more opinions as 30-A says....