so i just got my z6 head and my question is on the cam where it the "top" imprint? i see a pm number something. I cant turn the cam so do i have to unblot the whole assembly to place it so its top up? and another questins is the head only came with 3 bolts on the exhaust side....can i get these somewhere? how much? and i dont really see how you can tightened them in there holes? thx