I have a 98' YZ400F that has a 00' WR head. The cams came with the WR head when I purchased it. I also have the YZ cams. I am at the point of putting the cams back in the motor. Now the question is which to use? I've heard that the YZ cams are better to use. What I am wondering is can I use either one or will the YZ cam have valve clearance issues?