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  1. #21
    Join Date
    Aug 2007
    Location
    Bournemouth
    Posts
    318
    If this is a gradual problem then it will be down to something constantly changing with use, ie, ignition timing and/or carb set up. If your venturi chokes are too small or the jet is too big then that could induce backfiring as well. But check the float height adjustment too. Too much fuel will cause backfire as in your case, especially in the overrun.
    If this is an inherent problem then check your cam timing set up.
    Unless you have soot residue around the exhaust manifold mating to the head, I would dismiss that as the problem.

    David.
    Life is driving the Cobra. The rest of the time is just waiting.

    Wessex region caretaker rep.

  2. #22
    Join Date
    Jun 2007
    Location
    Lanarkshire
    Age
    43
    Posts
    189
    Quote Originally Posted by Darnpistonbroke View Post
    If this is a gradual problem then it will be down to something constantly changing with use, ie, ignition timing and/or carb set up. If your venturi chokes are too small or the jet is too big then that could induce backfiring as well. But check the float height adjustment too. Too much fuel will cause backfire as in your case, especially in the overrun.
    If this is an inherent problem then check your cam timing set up.
    Unless you have soot residue around the exhaust manifold mating to the head, I would dismiss that as the problem.

    David.
    The floats are fine as I checked them previously after reading the Holley manual so my thinking now is the overfuelling which in my simple non carb mind comes down to jets.

    The guy up here that does my mates mustang said its not really his specialist. His recommendation was John Sleath, unfortunately he is in Doncaster which isn't round the corner.... I was a bit surprised he didn't offer anyone closer or at least the right side of the wall.

    Thanks for the input from all so far
    Andy
    Dax- 350 Chevy, Holley Carb - Loads of smiles to the gallon SOLD
    AK- 383 Chevy - Even more smiles to even more gallons

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