Since those tubes were only epoxied on the ends, I would revise my advice and say clean up the pushrod holes like I mentioned above, clean the tubes you have, roughen up the outside of each tube and coat them and the pushrod holes completely and push them back in. The extra epoxy should insulate the tubes and aluminum enough to keep them locked in place indefinitely if done correctly. Someone did not do you any favors with only putting epoxy on the ends. If there are pin holes in the intake ports where the tube area was weakened, any excess epoxy from the inside the pushrod hole should seal it off if you twist the tubes as they are inserted. Joe-JDC