Hi all; I posted this in the WR forum too, but I'm hoping someone over here might know as well! Just put the 2004 YZ450f cam in my 2004 WR 450 tonight; Clearances came out all right; but on the new (YZ) exhaust cam, the 'punch marks' are placed differently than the old WR cam. The question is, do I use the lower punch mark and line up up with the top of the case, or do I make sure the upper punch mark is in the same place on the chain as the last was? If I place the upper punch mark on the same place in the chain the old one was located, the lower mark is not placed correctly on the case. Here are some photos of what it looks like installed. http://www.utahconcerts.com/postpics/cam1.jpg http://www.utahconcerts.com/postpics/cam2.jpg I've read 12, 13, and 14 marks; but I can't seem to find a definitive answer on this anywhere!