Feedback Score: 0 reviews
Join Date: Mar 2011
Location: Central New Mexico
Re: Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing
I think you got the input you were looking for. I'm running 4 over max, and thats only at the top. I'm also running nothing but premium now and have a little room being at 6000ft. I'm also running stock CR. If i was running your CR, i'd just drop it back to stock timing to be safe and not worry about it. If i remember right, when i was on the dyno, the difference between stock timing up top and 4deg over was 1 maybe 2whp max. Nothing to write home about....