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Thread: 383 backfires on passenger header at big end

  1. #1
    Junior Member APPRENTICE
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    383 backfires on passenger header at big end

    after a quick rev with rpm dropping I have a back fire in passenger header I has never done this before timing is good. Could a valve be out of adjustment I have poly locks and a stud girdle

  2. #2
    Senior Member DYNO OPERATOR bixblk's Avatar
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    check the valves

    the popping maybe a cracked valve spring , or unseated valve. carefull I would lookin to it before racing again. pull the valve covers and check things out JMO

  3. #3
    Senior Member RACING JUNKIE
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    Check your header bolts/gaskets, a exhaust leak will cause one to backfire.
    ***IN GOD WE TRUST***

  4. #4
    Senior Member RACING JUNKIE
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    it could be many things a broke or weak valve spring is what i would check for first if it was running fine before. Also do a leak down on the cylinders to make sure the rings and valves are sealing. That will tell you real quick were the cause is

  5. #5
    Senior Member EXPERT BUILDER
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    Valve Spings X3
    Blowninjected 540 - when is going fast, Fast enough ?????

    http://www.racingjunk.com/profile/182079

  6. #6
    Senior Member RACING JUNKIE curtisreed's Avatar
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    I agree with Charlie. Check for header leak. Gets a large shot of fuel when the throttle is closed and when it sucks air past the flange it will ignite in the header. Mine will do it if I don't keep an eye on the bolts.

    Curtis

  7. #7
    Junior Member APPRENTICE
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    you Guys nailed it loose header bolt thanks to everyone that replied

  8. #8
    Senior Member RACING JUNKIE
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    Man, isn't that awesome when it is something that simple??? If it were ME, I would have a spun bearing, wiped cam w/ several busted polly locks & a cracked head... plus a dog peeing on the front wheel too.
    "I would walk through hell on Sunday before I fear the enemy"

  9. #9
    Junior Member APPRENTICE
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    It was a simple fix I had a lot of bad thoughts too thats what is great about the forums there is so much knowledge out there and people willing to give advice

  10. #10
    Senior Member RACING JUNKIE
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    Quote Originally Posted by nutup
    It was a simple fix I had a lot of bad thoughts too thats what is great about the forums there is so much knowledge out there and people willing to give advice
    Amen. Great folks here. I have learned a bunch from many of them over the years... stick around... something else will happen. LOL Welcome.
    "I would walk through hell on Sunday before I fear the enemy"


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