Not sure what I would be looking for in a compression tests. Myron's spec sheet says stock 78 1.5 hp has none. 79 and 80 had .4mm (pretty dang thin). 2 hp had none.
Mine has a gasket, and it looks like more of 1.5mm to my eye, but I won't know until I pull the head and check it. At any rate, I should have no gasket for the 2 hp version.
My question is, how much difference does it make? Is it worth messing with?