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OldRide Answers Home Using OldRide Answers Ask a Question   Browse Questions In: AMC Buick Cadillac Chevrolet Chrysler Dodge Ford Lincoln Mercury Oldsmobile Packard Plymouth Pontiac Studebaker Volkswagen Other Makes Classic Trucks  General Topics General Questions Help Identify Classic Car News General Restoration Vehicle Maintenance Site Suggestions & Comments            Search Questions:    miike45      I have a performance 454 chevy engine. What makes it backfire when you let up on the gas? Is the timing slow or fast. posted: March 25, 2008       Answers (5)   dodgewolfgang      too free flowimg exaust. mount a catalinic converter if you dont have one or install a new more restrictive muffler. the backfire sound is unburnt gas exploding in the exaustpipe. posted:  March 26, 2008   showtime      Does it backfire through the exhast or carb. ? Possibly valves set too tight. Points or electronic?? posted:  March 26, 2008   66l79      timing is probably off posted:  March 26, 2008   miike45      First of all, thanks for all the answers. I probably didnt give you enough info on things. Here goes: I built a 454 chev. It has tunnel ram, 2 4's, 11:1 compression and other goodies. It has a unilite mallory ign (all new) all new timing chain and accessories, short primary headers. It back fires through the exhaust. Someone told me to unhook the vacum from the dist and plug it. I did and no good, still does it. I have tried timing it from 0 to 30 advance and still does no good. Also I have it running on 108 octane fuel. And no, I have no smog pump. Thanks,, Mike posted:  March 27, 2008   valensage48      Could you have slipped off mark when you were putting it back together? valensage posted:  April 5, 2008

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