personally I wouldnt run more than 9.8-10.0:1 for a super charged engine. 12:1 can be done with some good tuning and low boost levels, but go lower so you can get the power that the built engine has potential for.
"you would probibly have to build a forged 347 with dished pistons 8.5-9.5:1 compression. if going turbo go with the lower compression, if going with a supercharger go 9:1 or higher." i have a question... with 12:1 compression work for a supercharger on a 4 cylinder? friend of mine is building his motor.. thanks
