I am currently semi-rebuilding my engine (new rods, pistons, piston rings, rod bearings, hone, cylinder pressure test, cylinder deck, surfacing block myself, short block still in engine). Dropped the cylinder head off to the machine shop today, and he is doing that part for me (dismantle and reassemble for pressure test). I marked on the cam gear with a mark on my belt. Did the same for my crank gear. This way, can't really goof on setting the timing correct. Told the machinist about my mark and not to remove it. He understood completely.