Casting Dates

Discussion in 'Buick FAQ' started by johnson1946, Mar 30, 2014.

  1. johnson1946

    johnson1946 Member

    Attempting to figure out the dates codes on 455 exhaust manifolds? Need help........thanks rlj
  2. Art B

    Art B Well-Known Member

    From what I have seen, the date code is a 3 digit number that corresponds to the consecutive day of the year, The year must correspond with the year, but I have not seen a breakdown of P/N vs. year.

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