340 build

I think I sky made a cutter that looked like a valve, but with a cutter head built into it. you bolt the head on the block with a couple of bolts, and the cutter in place, and then you chuck the cutter-valve valve stem in a drill and spot face each piston head properly. It's not super hitech, but it's pretty quick and easy, and there is little guesswork, and the piston cuts should be pretty consistent.