Here’s the finished head shape polished with 1/16th radius and gasket area lapped on a surface plate.
Checking the deck clearance I can use a .005″ head gasket which is my thickness of choice. I made this tool that lets me bore out the ID for the bigger piston size. Basically you center the gasket then clamp a plate over it and bore it out. If someone makes head gaskets for these bigger pistons please let me know.
Checking the head space to find I’ve got 10.5CC, should be trouble free for any kind of fuel or exhaust system I want to use.