Hey i have a 1967 ranchero with a 390 and a c6. The motor has headers ,performer intake and cam also it has a 670 holley and a msd distrbutor. I was wondering how can i tell what my comprission ratio is and how good is the C8AE- heads? thanks
Printable View
Hey i have a 1967 ranchero with a 390 and a c6. The motor has headers ,performer intake and cam also it has a 670 holley and a msd distrbutor. I was wondering how can i tell what my comprission ratio is and how good is the C8AE- heads? thanks
Compression is a function of bore, stroke, chamber size, piston dome, rod length, gasket height, deck height and intake valve closing angle.
Some models include piston to cylinder clearance and top of piston to first ring height also.
Given those parameters - static and dynamic compression ratios can be derived.