I think the ACL forged pistons have 8.2:1 compression, and the engine has stock valves, with a set of performance springs valve springs, and tony ported the head himself at home in the shed. I was sceptical about the boost at first, but I've heard it from 2 other people since, and I know it run a 10.3 on 23 or less last time on a poor track. The big killer is the 60ft, which would have picked up 3-5 tenths over most cars at this power level. Goes to show what suspension setup can do for a car. Tony is at the winternationals this weekend with his V8 VH drag car, he said he'll send me some pics to put up monday. Cheers............................6BOOST