I got compression numbers from a guy on the focus fanatics forums. He says that shaving .040 = 10.8:1CR and that .045 = 11.0:1CR He sells zetec heads that are already prot and polished and shaved to the desired compression ratio. I am thinking about the .040 as he doesn't recommend anything more on pump gas. What is the factory compression ratio for these motors? I am not trusting the carpoint website as it is ussually wrong. Is ours 9.6:1? Also a copper headgasket is a good idea but is it necessary since miy stock one has held fine with 155k miles on it?

ATX MTX swap, rear drum disc swap, drilled rotors, ported intake, optim throttle body, CAI, 7.5L MAF, adj. fuel regulator, longtube headers, underdrive pulley, no EGR, low inpedence bigger injectors, 2002 Focus Swap