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Old 04-30-2013, 08:13 PM
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chevy 350 runs good then backfires under load

i have a chevy 350,standard bore engine,4 bolt main.comp cam 270 h-10 grind.edelbrock 600 carb.410 gears,4 speed saganal tranny in a 68 firebird...engine runs good then out of nowhere it starts to backfire under load.after it has run for about a half hr.ran good all last year.just startind doing this.i would be thankful in any body can give me a direction to go to figure out the problem.can this be timing or carb.thanks in advance for your comments

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Old 04-30-2013, 08:19 PM
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Simple first, have you looked at the dist cap for moisture, crud on the tower contacts, cracks or carbon tracking? Vacuum leaks?
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