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Engine Date Code

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  • David A.
    Infrequent User
    • December 22, 2015
    • 2

    Engine Date Code

    I have an early 63 coupe (00063) What date code 327 340hp engine should I have??
  • Don H.
    Moderator
    • June 16, 2009
    • 2262

    #2
    Re: Engine Date Code

    Your car build date is roughly 9/18/62. Engine date stamp would likely be within a couple weeks preceding the build date.
    Welcome to NCRS and the Technical Discussion Board.

    Comment

    • Michael J.
      Extremely Frequent Poster
      • January 27, 2009
      • 7122

      #3
      Re: Engine Date Code

      Don is correct, but there is a 6 month rule in judging, so 6 months before your car's build date is acceptable.
      Big Tanks In the High Mountains of New Mexico

      Comment

      • Joe R.
        Extremely Frequent Poster
        • May 31, 2006
        • 1822

        #4
        Re: Engine Date Code

        Originally posted by Michael Johnson (49879)
        Don is correct, but there is a 6 month rule in judging, so 6 months before your car's build date is acceptable.
        Michael,

        You are of course correct. But for a S/N 63 car, I don't think the six month rule works all that well. Maybe a two month rule would be better here.

        Joe

        Comment

        • Dale M.
          Expired
          • December 27, 2007
          • 386

          #5
          Re: Engine Date Code

          This brings up an interesting question, how far before the production year did they start making parts? I would assume they needed some lead time to start production, but it is likely shorter than 6 months.

          Also, the rule is 6 months, but should this rules be revised for cars built early in the years production cycle?

          I am always learning, thanks

          Comment

          • Michael J.
            Extremely Frequent Poster
            • January 27, 2009
            • 7122

            #6
            Re: Engine Date Code

            I think the 6 month rule is there so that judges don't have to make myriad guesses like that, since there are cases where "anything is possible" about parts. But I agree, "usually" an early MY car should have a closer date code on most everything.
            Big Tanks In the High Mountains of New Mexico

            Comment

            • Michael W.
              Expired
              • April 1, 1997
              • 4290

              #7
              Re: Engine Date Code

              Originally posted by Joe Raine (45823)
              Michael,

              You are of course correct. But for a S/N 63 car, I don't think the six month rule works all that well. Maybe a two month rule would be better here.

              Joe
              The same could be said for just about any instance where a new casting number component was introduced. Not unique to '63 or just engine cases and casting dates.

              There's no real need for such a restriction as the engine case casting date is judged before the assembly date. If it's 2, 3 (or 6) months before the car assembly date, it means that GM did manufacture the parts that far ahead for what ever reason. If the engine assembly date is after the casting date but before the car assembly date, who are we to say it could not have happened?

              Comment

              • Joe R.
                Extremely Frequent Poster
                • May 31, 2006
                • 1822

                #8
                Re: Engine Date Code

                Originally posted by Michael Ward (29001)
                The same could be said for just about any instance where a new casting number component was introduced. Not unique to '63 or just engine cases and casting dates.

                There's no real need for such a restriction as the engine case casting date is judged before the assembly date. If it's 2, 3 (or 6) months before the car assembly date, it means that GM did manufacture the parts that far ahead for what ever reason. If the engine assembly date is after the casting date but before the car assembly date, who are we to say it could not have happened?
                Hi Michael,

                I agree with you. When I said two month rule, I overstated my case a little bit. I never exaggerate! Anyhow, I was just stating what I feel is more likely from a production standpoint. But on the judging field, the six month rule would still apply.

                Joe

                Comment

                • Mike E.
                  Extremely Frequent Poster
                  • February 28, 1975
                  • 5138

                  #9
                  Re: Engine Date Code

                  Since the casting number (3782870) remained the same between 62and 63, and the suffixes remained identical, (RC, RD, RE, and RF) why would it be illogical to expect a carry-over between the two? They certainly would not have purged the engine storage area at either Flint or St. Louis between model years.

                  Comment

                  • Bob R.
                    Extremely Frequent Poster
                    • June 30, 2002
                    • 1595

                    #10
                    Re: Engine Date Code

                    The engines were very similar but there were differences, carburetor, exhaust manifolds, PCV, ignition shielding. They must have had some system of switching over to the new model year.

                    Comment

                    • Sydney G.
                      Very Frequent User
                      • February 1, 1994
                      • 444

                      #11
                      Re: Engine Date Code

                      Hi David,
                      My coupe is a 300hp #15,240.
                      From the research I've done and by comparing it's engine numbers with about 5-7 other cars built around it I believe that my engine is original to my car.
                      My coupe was built May 15th. The engine casting number is May 6 and what remains of the stamp pad shows May 8th.
                      With your '63 being a 340hp and also being very early in production there might be a greater lapse between engine date code and car build but I hope my example gives you an idea.

                      1963 #63! Pretty cool. I like to record them so what are it's original colors if you don't mind?
                      Syd

                      Comment

                      • David A.
                        Infrequent User
                        • December 22, 2015
                        • 2

                        #12
                        Re: Engine Date Code

                        Ermine White with Black Interior

                        Comment

                        • Michael W.
                          Expired
                          • April 1, 1997
                          • 4290

                          #13
                          Re: Engine Date Code

                          Originally posted by Bob Rosenblatt (38164)
                          The engines were very similar but there were differences, carburetor, exhaust manifolds, PCV, ignition shielding. They must have had some system of switching over to the new model year.
                          That's the purpose of the engine code on the stamp pad.

                          Comment

                          • Bob R.
                            Extremely Frequent Poster
                            • June 30, 2002
                            • 1595

                            #14
                            Re: Engine Date Code

                            Michael
                            The engine codes for 62 and 63 were the same

                            Comment

                            • Michael W.
                              Expired
                              • April 1, 1997
                              • 4290

                              #15
                              Re: Engine Date Code

                              Originally posted by Bob Rosenblatt (38164)
                              Michael
                              The engine codes for 62 and 63 were the same
                              Were there differences in the 'bare' engines as shipped from Flint?

                              Comment

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