Restoring Rusty

[Gregski]

Gentlemen, could it still be the exhaust header even if the noise goes away when I unplug the spark plug wire on #4?

I am tempted to pull the headers off (at least on that side) and bolt up my old manifolds and see what that does, but if you think its a waste of time knowing that there is no noise with #4 plug disconnected than let me know.

[79sierra]

Originally Posted by Gregski

Gentlemen, could it still be the exhaust header even if the noise goes away when I unplug the spark plug wire on #4?

I am tempted to pull the headers off (at least on that side) and bolt up my old manifolds and see what that does, but if you think its a waste of time knowing that there is no noise with #4 plug disconnected than let me know.

Sure, but hard to tell without hearing it. I wouldn't put the manifold back on, I would pull the header and check the gasket around #4. Double sure would be to remove the header and check it for any high or low spots with a straight edge and also check the head around that exhaust port. Hope it is not internal!