Same thing happened to me after rebuilding. If I am not mistaken, carb backfire is attributed to a too lean condition. Try letting each of your two fuel mixture screws out 1/4 turn. Any one else agree?
Rebuilt Carb backfire HELP!
Just rebuilt a holley 600cfm, vac. secondaries and it seems to be fine except when I hit the gas. I'm getting backfire through the carb. I just bolted it back on, so I havent had time to adjust the mixture or floats. Maybe that's the problem, but I thought I'd check since I wont get back to it until tomorrow. TIA for any help.
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