Ok, I built a high compression LS-V for a track car. I put high comp race pistons in it, stock LS rods and new bearings. The oil pressure switch is on a T-line on the back of the block running to the correct location on the head. When I check the motor with a compression tester, it shoots straight to 300 (the cap of the tester) and bounces there. The problem is that it blows the head gasket and starts mixing oil with the water very often. I've replaced the head gasket 3 times in the past 2 days and am getting tired of it. Any ideas?