Ok I compression tested it with a very pleasing 150psi in all cyclinders BUT... I pressure tested each cyclinder by connecting a compressor up to it and filling the chamber up with compressed air, on every account my radiator started to overflow. *$%* What to do? If I decide to get a HKS MHG do you need O-rings? Or can i leave them out. Considering the block is oringed already but could be causing the above problem. What to do?