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Message: <blockquote data-quote="SN90FiveOh" data-source="post: 1468229" data-attributes="member: 20223">I know, Those two do not go together. But, for science, what would it take for me to get 12:1 compression from an 04 Mach1 engine without stroking it. Has anyone here milled one of these heads for a compression bump? I had a set done for a 2 valve years ago but I'm not sure how much hacking I can do with these.What I'm seeing is that flat top pistons with valve reliefs would put me near 10.5 and then bringing the piston just above the deck could yield 10.8, but if I can get the chambers down to maybe 48cc instead of 52 I'd be in business. 45cc would be even better. Feel free to let me know how crazy I am.</blockquote>