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10069286

  1. big-blue

    Questions about 454 build process at GM factories

    Two questions ... I am investigating my 454 block, as the heads are at the machine shop, confirming a few details from what the PO told me about the engine and the various stampings found on it. It's indeed a '90 Mark IV block, casting 10069286, forged on Feb 20th, 1990 (B 20 0). Its a 4-bolt...
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