as per Blower Drive Srvice compression chart at 6.5 compression then you inject 24# of boost their (chart doesn't go any higher) you end up with an enine that has 17-1 compression at full boost. thats only at 24# their are varibles such as cam timing leeky valvs that figure into this, but this sound like a lot of BS. if your thinking of running a blower get one of bds's catologs it has alot of info on drive raios, boost, compression ratios and a lot more
