I was wondering how much material I could get milled off my sbc heads safely to raise the CR. I will be using flat top pistons with 2 valve reliefs, blue felpro head gasket, about a .490 lift cam with 1.6 ratio rockers. I just want to bump up the CR some more.
I was wondering how much material I could get milled off my sbc heads safely to raise the CR. I will be using flat top pistons with 2 valve reliefs, blue felpro head gasket, about a .490 lift cam with 1.6 ratio rockers. I just want to bump up the CR some more.
Are we to assume the displacement, deck clearance (measured not guessed at), and gasket thickness? All of these effect the static compression ratio.
However, milling a 78cc head is pretty ineffective for getting compression up, most you can take is .030 inch before the casting gets to weak to hold the gasket against the cylinder pressures. That amount only nets about .5 to 1 additional ratio.
While you don't want to hear how bad the 882 head is, them's the limits, decide for yourself whether its worth pouring more money into them for such small returns. I'd appreciate your position on the 882s if the Rome where you live is Italy, but if in the U.S. you have more effective choices.
.030 max
but youll also have to take some off the intake side so that the intake will fit properly without leaks.
a good machinist know that but just incase mention it.
F-Bird do you not understand English, I said I don't want to hear how bad these are, frankly I don't care, I have them, have put money in them, and will work with them.
To other people the bore is 4.155, blue felpro gaskets with flat top Kieth black pistons.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Hot Rod Forum
2.2M posts
175.6K members
Since 2001
A forum community dedicated to hot rod owners and enthusiasts. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more!