Great answer Tech1! I followed the development of the 332 and 352 up to the 390 but at that point in history I got involved with VWs and did not know where the 460s originated. So you are saying that one of the possibilities is a tight valve guide? That would bend a pushrod but not push a valve in at the wrong time so the damage may not be more than the pushrod. That would be good except there may be others. I had a tight guide in a rebuilt MG midget engine and the fix was to thread a piece of rope in through the spark plug hole, compress the spring, remove the keeper and spring and then attach a 3/8" drill chuck to the valve stem and spin the thing with lubrication until it "wore in". That was not my idea, it was done by the MG shop guy. The rope in the cylinder held the valve up while the valve was being spun. Actually he overdid it because I then experienced some added oil consumption, probably down around the valve stem. Therefore if this approach is used it should only be done a little at a time until the valve is free. Do you miss the T-bucket Tech1? Anyway your comments are valuable!

Don Shillady
Retired Scientist/teen rodder