Ok I have a 94 GSR currently in process of replacing main bearing and piston rings.The motor currently has 11.5:1 compresion w pr3 head.I am wanting to change back to b18c head but am wondering how high the compression would be with a 3 layer head gasket.I know I should be using the compression calc but I don't know the details on the arias pistons currenly installed I do know the motor is 11.5:1.Reason for doing this is for smog visual.