[89turbocabmike]

Jim I've been subscribed to this thread hoping to learn as well. I'm surprised that none of the specialists have chimed in. I'm certainly no guru but I have installed and timed my own SC cams as well as rebuilt 6 non-porsche engine so I understand your query. Your noise assumption makes sense. As long as proper procedure is used timing the cams,turning the crank always clockwise directly to TDC, the clearance still would seem to have minimal effect on timing.