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  1. #1
    Join Date
    Jul 2010
    Location
    Southern California, Nevada, AZ
    Posts
    6

    Default 429 Grand Prix Factory HP

    My 1969 Grand Prix engine block is stamped 05055167 / XF.............Can anyone tell me how to find out if that is the 360/370 or 390 HP block??
    Thanks

    Greg

  2. #2
    Join Date
    Oct 2008
    Location
    Portland In
    Posts
    781

    Default

    Don't you mean 428?
    yr cid hp code comp cam heads Carb
    1969 428 370 HP XF A 10.5 066 62 1-4 7029268 GP Block Casting # 9792968
    Last edited by Mike Nixon; December 29th, 2010 at 21:29.

  3. #3
    Join Date
    Jul 2010
    Location
    Southern California, Nevada, AZ
    Posts
    6

    Default Grand Prix 428

    Yes, My subject was off by one number on the keyboard , my bad.........I mean 428 production engine

    Thanks

    Greg Allison

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