Found the manifold leak, but....

[jabborabbo]

Originally Posted by bcfishon

Sounds like you could possibly have a bad piston wrist pin,try removing a spark plug wire, one at a time and see if the noise changes,if and when it does you just found your problem cylinder.

Ok, when I pull the plug wire off cylinder 3 the knocking stops...wouldn’t a bad wrist pin have a double-click rather than a single knock?

And, the exhaust leak is on the opposite side of cylinder 3....