The manifold bolts on the 216 don't usually sieze too bad, since the heads are cast iron. The few that I have removed came off pretty easily.

Tightening the bolts probably will not help. The long castings warp easily under repeated heat/cooling cycles. The good news is that you can unbolt the intake and exhaust manifold as a pair and have a machine shop resurface them to flat as a unit. It should cost about $50 in most places.


Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic.