Hoss, Yes, it's backfiring through the exhaust. It occurs at idle all the way through the RPM range, assuming I can get it to go off idle. If I feather the throttle I can bring the RPM's up but it's raising hell all the way. The good news is, it's consistent. If it weren't and that thing backfired just every once in a while, I'm at the age where I'd have to worry about a heart attack :-)

techinspector, I'll re-lash them using your method. That makes more sense to me than rolling them. Is it best to adjust them while they're hot and pumped up or after they've bled down ?? I can dial the fuel pressure down to 5 lbs. I'm pretty sure I can adjust down to 3. WOuld that be better at idle ?