On my 70 SS I jacked the engine up to remove the drivers side header. One tube was rubbing the brake distribution block and making a squeaking sound at idle. This car has a 427 with a very lumpy cam that caused the engine to jump around making the squeak unbearable. It seems to have started after I had the engine out for some work, I put new motor mounts on the engine before putting it back in, they must be a little different than the old ones.
Anyway, a torch and a ball pein hammer and no more squeak.
Ron
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