I finaly got all of my engine parts in ( JE 85mm 10.5:1, Webb 88 grind, Cometic gaskets and Kibblewhite springs. The cyl head has also been ported and polsihed. I am taking the head/jug to the machine shop I am thinking of getting the head milled for a fresh surface and a little more compression like 11:1. I was wondering how much can I do safely with out valve to piston contact?