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The engine is a 351CJ with a 4V Holley
Today for the second time, about the time the engine caught to start running, there was a monster backfire. My wife said all the neighborhood lawn mowers quit. The engine cranked for maybe 10 seconds, released the key, cranked again for maybe 10 seconds and as the engine started running comes the big POW! The engine ran OK after that and never showed any kind of problem for the rest of the day. Are talking about a timing problem? Maybe a carb? Anybody shed some light on this?