What's wrong with my motor?

moparisbest said
did you plug the exaust smog holes on the heads some times if your manifolds dont cover them holes on the 360 and it will sound like lifter are rocker arms clatering when its really one exaust leak i thank that they used them heads on alot of trucks and the truck exaust manifold would cover them holes but the car manifolds are headers wont

The heads are early U heads, no smog holes. The manifold is an early 340 freeflow on the passenger side.

It is possible that it is an exhaust leak, but it sure makes a bunch of noise and the fact that I'm not seeing any oil filling up the rockers and running down the springs makes me think it is lack of oil flow.