C50F -J vs C40F-AL Autolite Carbs

1st Official Post

    Can someone explain the differences in these two Autolite Carburators for me?


    Is one more correct than the other for a 64.5 K code, 4 speed that was made in July 1964?


    Thanks

    Edited once, last by SixT5HiPo (February 25, 2010 at 12:28 AM).

    • Official Post

    The only real as built difference between the two are jet sizes. The C4OF-AL uses 51 primary and 70 secondary jets. The C5OF-J uses 52 primary and 68 secondary. Both carburetors are for use with a PCV valve.


    -Fred-

    65 Koupe early San Jose Phoenician Yellow 4 speed
    66 GT Koupe Dearborn Blue 4 speed
    66 KGT San Jose fastback pony interior Silver Frost 4 speed
    64 Falcon sedan delivery 289 4 speed
    65 Ranchero 289 4 speed
    66 Corvette roadster 427/425 4 speed

    In the Ford Carburetor Guide (Pony Carbs Inc), a C5OF-J was used after Feb 15, 1965. Prior to that date, the C4OF-AL was used with a C5OF-L tag (pg 94-95). (Note: -L vs - J suffix.)

    Jim

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