Hey guys ive been getting some backfiring threw the card on my 406 in my 80z. The carb is brand new, and good plugs,wires, and distributer. I tried to set the timing a while back but seems like it still backfires here and there threw the carb. also from a stand still when i punch the gas all the way down it will either almost kill, backfire threw carb, or kill. Seems to idle fine by itself, anybody have any ideas?

<font face="Arial,Verdana" size="2">Originally posted by 5LiterEater:
Hey guys ive been getting some backfiring threw the card on my 406 in my 80z. The carb is brand new, and good plugs,wires, and distributer. I tried to set the timing a while back but seems like it still backfires here and there threw the carb. also from a stand still when i punch the gas all the way down it will either almost kill, backfire threw carb, or kill. Seems to idle fine by itself, anybody have any ideas?</font>

backfire thru the carb indicates you're going lean. you need more pump shot or a different power valve

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1972 chevy camaro ss
425HP 350sbc old school build-up

restification in progress 70's baldwin motion NHRA gasser with old school day2 parts
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if it's to loud your to old

What kind of carb? Sounds like its a simple Accel pump adjustment

Ok after some tuning of the carb a little and a fresh new set of plugs it seems to be resolved from todays test. I have a 750 holley dp by the way. Ill let you know if it starts back up I was only able to take it out for a lil bit

Ok after some more passes it seems that the backfiring completely is gone. NOw for my new problem. I get a hessitation and a ruff choppy dirty idle whenever I hammer the gas. Like a quick bog. It does this off the line and also while moving. Is that a jet issue maybe?

Sounds like a classic accelerator pump issue. Goes, bogs, goes = you need one size smaller discharge nozzle to extend the lenght of time of the shot. Bogs, goes = you need one size bigger on the discharge to get more fuel in sooner.