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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
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valensage48
    
Could you have slipped off mark when you were putting it back together? valensage
posted:  April 5, 2008
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