455 2 barrell stumbles/misses at idle

Discussion in 'The Mixing shop.' started by Detrailers, Feb 13, 2016.

  1. Detrailers

    Detrailers Well-Known Member

    Greets all. I do not have much expeirience with carbs. I know my 455 is a 2bbl but not sure what the stock mfg was...I would guess Rochester??

    It has a slight stumble at idle in gear but otherwise runs perfect. Im thinking its carburation. Any help/advice apprieciated
  2. carmantx

    carmantx Never Surrender

    If it is original, it would be a Rochester 7044141.
    It could be bad accelerator pump in the carb. The old parts and new gas blends dont work well together. A good quality rebuild would take care of that for you.

    But also check your timing, to make sure it is advanced enough.
  3. rtv72

    rtv72 Founders Club Member

    before you get into the carb you should check all the basic's first. Check to see if any of the vacuum lines are off or cracked and leaking, carb base gasket, make sure your timing and points are adjusted to spec, make sure the vacuum and mechanical advance's are working, the spark plugs are good and gapped correctly, check the cap and rotor, fuel filter. All these things can add up to your issue. The emission decal on the radiator panel can help you with the t-up spec's. Check all the things you can before you spend any $$$ and it could still be the carburetor.

    Good Luck!

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