OtisWinslow wrote:

Check for any cracks at the joint of the pipe and the flange that bolts
to the head. Also at the joint between the muffler and the riser if
you have one.

*Everything* forward of the firewall has been checked, and much of it
resealed, a couple of times. That's why I'm looking for something "else".

But thanks...

Andrew

P.S. Since we're on the subject, though: "the head" of what?