1972 Chevy Chevelle popping

1972 CHEVROLET CHEVELLE
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RICKSS
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Engine Performance problem
1972 Chevy Chevelle V8 Two Wheel Drive Manual

Hi, my 72 Chevelle with a 454 has a popping sound, ( small backfire) from the exhust, seems on passanger side only. When its sitting and idleing and I rev it up it seems ok but when Im driving it im getting this popping?
Any ideas?

Thanks
Jun 30, 2009 at 9:19 AM
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BUDDYCRAIGG
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backfire is normally a sign of being too lean
Jun 30, 2009 at 10:13 AM
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RICKSS
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Hi, its not like a backfire, its more like a popping sound. Have adjusted the carb, cannt get rid of the popping sound

Thanks
Jun 30, 2009 at 10:44 AM
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LOUT5369
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First let me say Nice car,Have you tryed adjusting the valves,it sounds like an exhaust valve isn't closing all the way.Put a vacuum gage on it,lets see if vac is steady,if the needle is bouncing you either have a valve too tight or a broken spring.Good Luck,Lou p/s I have a 427 Impala and I love BBCs
Jul 22, 2009 at 7:13 AM