Hi Folks,
    Just to wrap up the story:

    At the last writing, I had a cracked exhaust header where the pipe meets
the head at the #1 cylinder. Got all kinds of feedback for a temporary fix,
tried a few with mixed results. JB weld burned of into a powder pretty
quick, didn't try the hi-temp silicone ( the stuff I found was only rated
100 deg. higher than the JB Weld). Ended up with a product called Muffler
Weld. It doesn't burn off, but isn't very strong, and I had to do a couple
applications to build up the joint. That too eventually failed, of course
right during the high RPM section of the dyno test; too much movement at
that joint I'd guess. I heard the leak open up, and resigned myself to a
failed test, but miraculously it it passed with these crazy numbers:
            HC       CO        NOx
LIMIT      1.60      40.0       2.50
RESULTS    0.05      0.69       0.11

    Don't really know how to interpret the #'s, but am glad to have gotten
through. Having a nearly new cat. converter probably saved my butt, but
running by the book timing and idle could've helped.  Now at least I've
bought time to save up for some new headers.

Thanks for all your advice.

Matt Sutton
88 GL