I took the head off because of it running rough, and a tapping sound. Turns out a cam lobe was severly worn. WIth all these answers I'm a little confused. I took everything off with the timing mark on the cam lined up per the instructions. Everything is paint markered. I think there is two timing marks on the cam. Is one TDC? Did I take everything off with the oppisite mark lined up? So am I good just to line it up with the other mark on the cam and set the 1st cylinder to TDC? I have the position marked on the crank with paint marker. I've rotated it since removal to clean the pistons and everything else. So I can put it on the way I took it off. But I'd rather just set everything at TDC and call it a day. Would make me feel a lot better. Thanks for the advice, guys.