Reassembling z400. When I begin to tighten down the caps on the cams the cams sieze with the slightest pressure on a bolt. I run the bolts down by hand. And if I turn even one bolt a 16th of a turn the cam won't spin. I've oiled everything. Have the right bolts in the right holes. I torqued the head down to spec. The lobes are not in contact with the Buckets. It's the same stock stuff I pulled out. I have ethernet cam chain off the cams. Put new valves and seals in. Had the valve seats cut. Was trying to shim the valves when I ran into this problem. How freely should that cams move when torqued down.