My D16Z6 block is bored +.020 over. The block was redecked about .003". I'm running PG6 pistons which sit Zero Decked (and are now about +.003" because of the redecking). I'm worried about piston top to cylinder head clearance issues, because the only thing stopping the piston from making contact with the head is the head gasket thickness minus the .003". I can only find head gaskets for my over bore that are .030" thick. Is that going to be enough? I've read while searching that you want at least .040". Has anyone here ran tighter than this? Thanks!