Okay cant get really thick head gaskets here locally but can get decompression shims there .8mm which is about 32" throw on m,y standard felpro gaskets 39" and now I have 71" gasket,worst pop up piston is 27" means I have a clearance of 44" not exactly what I was after but hey shit happens gone from a 11.3:1 comp engine down to 10:1. I checked oil pressure with screw in direct gauge next to dizzy and cold it was reading 70psi at a 1000rpm, didnt want to wait for it to warm up just in case I do some more damage
Steve