acorn

I guarantee this is a new one... Finally got my valve spring compressor in the mail and went to town taking the valve springs and plungers off. Everything was going swimmingly, I have to say the valve spring compressor was a fantastic purchase. So I get to the exhaust valve on the right hand...

I've tried searching this for my son, but he is rebuilding an XS400 and the head studs/bolts have acorn nuts instead of regular nuts. We torqued the head to spec and per the pattern, but I'm thinking the acorn nuts bottomed out on themselves giving a false torque reading. My reason for...