Engine Identification

Discussion in 'Performance, Engine, and Transmission' started by Larry Hull, Feb 27, 2007.

  1. Larry Hull

    Larry Hull Member

    Feb 26, 2007
    I have a technical question that I hope someone can help me with:

    I have a 1968 Chevy, Shortbox Stepside, with a 250 C.I. 6 Cyl., 3-Speed. The VIN numbers support the 250/3 speed..

    This vehicle was originally from Georgia and brought to Canada 10 years ago.

    The issue is – the original 250 motor was replaced with a Canadian motor, verified by the serial numbers. I want to procure an original U.S. block for my re-build and have conflicting information on what the “block numbers” should be.

    I have an original 1968 Chevrolet Truck Chassis Service Manual and it states the following for block identification.

    Engine Number:

    F - Manufacturing Plant (F-Flint, T-Tonawanda)
    12 - Month of manufacture (December)
    10 - Day of manufacture (tenth)
    FA - Transmission and engine type

    However, according to American Classic Truck Parts – “Truck VIN decoder” for the 1968 model, the numbers are one of the following: ( TA / TC or TD )

    1/2-Ton TA 6 250 155 8.5:1 1-bbl Manual
    1/2-Ton TC 6 250 155 8.5:1 1-bbl Manual
    1/2-Ton TD 6 250 155 8.5:1 1-bbl Manual

    If the “T” stands for “Tonawanda”, what does the following number represent?

    The Transmission coding is as follows – the “W, K or S, do not correspond with the Service Manual?

    W N/A 3,4 speed Warner Gear
    K N/A 3 Speed McKinnon
    S N/A 3 Speed Saginaw

    Can anybody give me some feed back?

    Larry Hull,
    Ottawa, Canada.

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