I am replacing my turbo right now and in the past I have had detonation problems. I have been using the #2006 head gasket which crushes down to .070. My compression ratio cc'ed out at 9.2:1 with this gasket my 782 head and Wiseco pistons. As long as I have the head off I am looking for solutions to the high compression ratio. I wonder if anyone has had any success by un-shrouding the intake valve on this head casting. I also wonder if there is a thicker head gasket available. I am using a stock T2 intercooler mounted between the front facia and the radiator. Could it be this is too inefficient at reducing heat in the air going to the intake (20+ psi). I'm not real sure which way to go here but I want to solve the detonation problem if possible.