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Thread: 1956 buick carb

  1. #1
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    1956 buick carb

    i have a 1956 buick that im restoring for my wife and i have rebuilt the carb (2 brl carter) with a kit that i got online and it had ethonal safe parts in it so im not worried about that but my question revolves around the use of regular unleaded gas in this. i have heard conflicting things about using a lead additive , some say use it and others say that it isnt needed in the nailhead .what say the experts?

  2. #2
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    GM Bulletin 60A-100-2

    See attached GM Bulletin 60A-100-2 sent to dealers regarding use of unleaded fuel in pre-1971 vehicles. It recommends a lubricating additive containing lead or ?phosphorous if vehicle operates at continuous high speeds or tows a trailer.
    Attached Images Attached Images
    What has been, can be again. (Bob Wills, 1942)

  3. #3
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    ok thank you for the info that explains it!

  4. #4
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    Lead additive is probably not needed in a nailhead for valve seat protection. The tech article addresses detonation and carbon build up. For all their faults the modern fuels including E-10 burn cleaner and ethanol is an octane booster. I use 87 octane winter and 89 octane summer in mine.

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