425 dual quad rough running

Discussion in ''Da Nailhead' started by Michael Sørensen, Jun 9, 2019.

  1. Michael Sørensen

    Michael Sørensen New Member

    Hi all

    I have a 65 Wildcat with a 425 dual quad. The intake is an Offenhauser and the carburetors are Edelbrock 600cfm's. The distributor is an MSD with a MSD Blaster Coil.
    When I fire it up, it has some trouble keeping from stalling, but after a 30 second warmup, it runs smooth in idle. Then I can drive around for about 15min, where the engine is running perfect. Then it suddenly starts sputtering or jerking. At any constant speed and light throttle. When I give it full throttle, there is no problem. The electric choke is working as it should. Plugs are new. Distributor cap and rotor are new.
    Could it be a faulty coil?
    Intake manifold gaskets?
  2. telriv

    telriv Well-Known Member

    From the sounds of it most likely an electrical problem. I've installed three MSD dist. in "Nails". Two out of the box were NG & one quit within a few months. Definitely today's products are not as good than years past.
  3. Michael Sørensen

    Michael Sørensen New Member

    I will try to change the ignition coil and see if it helps. Or else I might try another distributor. Tom, do you have a suggestion for a good distributor?
  4. telriv

    telriv Well-Known Member

    For the most part "Nail" distributors are somewhat bullet proof unless they've gotten all rusty. I take stock dist., recuve them & rebuild them & install an electronic one wire conversion kit.

    Tom T.
  5. Stevem

    Stevem Well-Known Member

    Once it gets up to the temp where it starts to act up if you look down into the primary of each Carb with the engine at idle do you see fuel dribbling from the boosters?
  6. Houmark

    Houmark Well-Known Member

    Where are you located Michael? If you're up for it, I'm running a stock distributor, with Pertronix magnet pick up and recurve kit, togtheter with a Pertronix coil.. You could try swapping, and see if it eliminates the problem.. With you name, I assume you're Danish? I'm from Odense area..
    1972Mach1 likes this.

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