what cause a head to lift under boost. ARP head studs was torque to 72 lbs. No sign of detonation. The car run fine under normal driving with no harsh load. At idle the temp will rise. I know the head gasket is shot. Already did the leak down. HG is golden eagle 83mm modified gsr cnc one. Trying to get answers or suggestion from people who has encountered this problem. Is it the Product or installer error. Benson block.....does not have o ring. Vacuum is now at 18.5 hg. used to be at 22 hg...

 

what engine management and who tuned it?

 

i know some one who had the same issue, turned out that his sleeve dropped a couple of thousandths. block had to be re decked

 

What type of cyl pressure are we talking about????? and have you checked to see if the sleeves have sank any.. 72 lbs on the headstuds might not be enough depending on how much boost you are running..

 

i believe he is at 29 psi of boost and aem and the best tuner in so cal shawn church. and discussed today of head torque any one elses oopinion help my buddy our

 

what cams? and whats the timing look like on the .cal?

I used to have A HOLE LOTSA head gasket issues..I might be able to help..

also it may help you to o-ring the block or use a cometic hp head gasket..