Thanks for the replies. Keep them coming.
I will double check the timing & valve adjustment & look closely for exhaust
leaks. One thing that I noticed is that the backfiring seemed to occur almost
immediately as we left his house for a test drive. The car had not even had
time to heat up. I would not think that there would be enough heat in the
exhaust system to light off the backfire. We will try pulling out the choke to
see if the problem gets better or worse. I understand the concept of the
timing gear being installed off by 1 or more teeth, but I do not know how to
check for that other than at top dead center (on the compression stroke) both
valves should be closed. The engine was rebuilt by a shop that has
considerable experience, but of course anyone cam make a mistake. I also
understand how the distributor could be 180 degrees out, but it makes my head
hurt when I try to understand how the engine could run without manifesting any
other problems other than a single backfire upon shifting gears. This car
drove to Conclave last year & other than the backfiring, appeared to be fine.
No fuel mileage issues, starts easily, does not over heat, runs & idles
smoothly, etc.
Gary
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