V8_MA61 you lost me?10psi you could go 10-1 comp with good charge cooling.
mick,yes you will have less power with the lower comp but not a huge amount.are you changing to turbo? i ask as you dont need that low a comp with a sc12 as max boost will be 14psi or there abouts from them. on one of my 4agte motors i have the comp at 8-1 so i can run 30psi on the track.
mick