compression wasn't supposed to be that low. 9:1 is what i wanted but for some reason i just didn't happen.... don't ask..... i will raise comp. alittle in the future (thinner head gasket or mill the head just a little ) right now i'm running the most boost i can with no detonation on pump gas. 91oct. as far as the 550 cc injectors go they are to small.... i'm already at 85% capacity of these injectors. i'm looking for 720 cc so i can run 108 and 22 lbs of boost...... 400 whp here i come..... :twisted: