Todd Carrico wrote:

The only time I have had an engine back fire was with a way lean fuel
mixture.

Another time was when I had a distributor in backwards.  Didn't run worth a
damn.

I supose you could get the timing way out of wack and cause it to fire with
the Intake port open.

tc

...I have had my 911 for a long time and
no backfires.  Maybe just lucky.  Perhaps some years or
other variations are more likely to backfire??

...

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