Looking at 70 big block. Requesting help where to verify VIN & engine numbers - NCRS Discussion Boards

Looking at 70 big block. Requesting help where to verify VIN & engine numbers

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  • Billy H.
    Infrequent User
    • January 5, 2014
    • 5

    Looking at 70 big block. Requesting help where to verify VIN & engine numbers

    Found a red 70 big block in very good running condition.

    VIN: 194370S410943

    Engine cast # on driver side behind cylinder head: 3963512. the online records I find indicate this engine # for 1970 454 is for both 2&4bolt COPO engines.

    Anyone send me to the right place to verify these numbers?
  • Owen L.
    Very Frequent User
    • September 30, 1991
    • 838

    #2
    Re: Looking at 70 big block. Requesting help where to verify VIN & engine numbers

    My old copy of the NCRS pocket spec guide indicates 3963512 is a 454 and in 1970 was rated at 390hp; in '71 both 365hp and 425hp.
    The engine pad should have one of these suffixes: CZU, CGW, CRI, or CRJ depending on transmission and distributor.

    Comment

    • Terry M.
      Beyond Control Poster
      • September 30, 1980
      • 15573

      #3
      Re: Looking at 70 big block. Requesting help where to verify VIN & engine numbers

      If that 512 cylinder case is four bolt, it is an anomaly for 1970 model year.
      Terry

      Comment

      • Dick W.
        Former NCRS Director Region IV
        • June 30, 1985
        • 10483

        #4
        Re: Looking at 70 big block. Requesting help where to verify VIN & engine numbers

        Originally posted by Terry McManmon (3966)
        If that 512 cylinder case is four bolt, it is an anomaly for 1970 model year.
        Carry over? I have seen many 512 blocks that were factory clearanced for the additional stroke of a 454. The one that comes to mind was an LS-6 454 for a Chevelle.
        Dick Whittington

        Comment

        • Patrick B.
          Extremely Frequent Poster
          • August 31, 1985
          • 1986

          #5
          Re: Looking at 70 big block. Requesting help where to verify VIN & engine numbers

          The OP didn't say this was a 4 bolt block. All 70 454's are 512 castings as well as some 69 427's. Nothing out of the ordinary is in his description of the car. If he would post a picture of the pad, it will probably show a completely typical engine.

          Comment

          • Billy H.
            Infrequent User
            • January 5, 2014
            • 5

            #6
            Re: Looking at 70 big block. Requesting help where to verify VIN & engine numbers

            this helps. thanks Owen

            Comment

            • Billy H.
              Infrequent User
              • January 5, 2014
              • 5

              #7
              Re: Looking at 70 big block. Requesting help where to verify VIN & engine numbers

              thanks. this helps

              Comment

              • Dick W.
                Former NCRS Director Region IV
                • June 30, 1985
                • 10483

                #8
                Re: Looking at 70 big block. Requesting help where to verify VIN & engine numbers

                Originally posted by Patrick Boyd (9110)
                The OP didn't say this was a 4 bolt block. All 70 454's are 512 castings as well as some 69 427's. Nothing out of the ordinary is in his description of the car. If he would post a picture of the pad, it will probably show a completely typical engine.
                I have seen 512 blocks as early as April 69.
                Dick Whittington

                Comment

                • Billy H.
                  Infrequent User
                  • January 5, 2014
                  • 5

                  #9
                  Re: Looking at 70 big block. Requesting help where to verify VIN & engine numbers

                  I'll check into a picture of the pad

                  Comment

                  • Thomas H.
                    Extremely Frequent Poster
                    • August 31, 2005
                    • 1053

                    #10
                    Re: Looking at 70 big block. Requesting help where to verify VIN & engine numbers

                    Originally posted by Terry McManmon (3966)
                    If that 512 cylinder case is four bolt, it is an anomaly for 1970 model year.
                    Hi Terry,

                    I have a an early 71 S/N 1632 with a 512 case and 4 bolt main.......

                    Tom
                    1958, 283/245, White/red - Top Flight, October 2016
                    1960, Black/black, 283/230 4sp
                    1966, Black/Red, 327/350 4sp w/AC
                    1967, 427/390, 4sp, Goodwood Green, Coupe
                    1971 LS5, 4sp, coupe, Bridgehampton Blue
                    2007 Z06, Lemans Blue

                    Newsletter Editor, Delaware Valley Chapter

                    Comment

                    • Terry M.
                      Beyond Control Poster
                      • September 30, 1980
                      • 15573

                      #11
                      Re: Looking at 70 big block. Requesting help where to verify VIN & engine numbers

                      Originally posted by Thomas Hoyer (44463)
                      Hi Terry,

                      I have a an early 71 S/N 1632 with a 512 case and 4 bolt main.......

                      Tom
                      1971 model year is fine. Note the difference between Model Year and calendar year. I would not rule that out for the 1971 Corvette due to the LS6, even though the production of that motor was later in the model year than your car.

                      There were 4-bolt 512 cylinder cases in Corvettes in the 1969 model year, so there is no doubt that those cases existed in 1970 Corvette model year, but there was no need for them in the LS5 in 1970 model year.

                      As Dick W pointed out above, the Chevelle LS6 (not to be confused with the Corvette LS6) probably had a 512 cylinder case with four bolt mains. I was thinking Corvette and failed to back up and look at the larger picture. However, I still stand by my statement you have copied above.
                      Terry

                      Comment

                      • Dick W.
                        Former NCRS Director Region IV
                        • June 30, 1985
                        • 10483

                        #12
                        Re: Looking at 70 big block. Requesting help where to verify VIN & engine numbers

                        Originally posted by Terry McManmon (3966)

                        There were 4-bolt 512 cylinder cases in Corvettes in the 1969 model year, so there is no doubt that those cases existed in 1970 Corvette model year, but there was no need for them in the LS5 in 1970 model year.
                        Kermit has a 9289 block, VIN Sept '71 build
                        Dick Whittington

                        Comment

                        • Justin S.
                          Very Frequent User
                          • July 3, 2013
                          • 289

                          #13
                          Re: Looking at 70 big block. Requesting help where to verify VIN & engine numbers

                          Terry,
                          In order to make a 2-bolt case into a 4-bolt case, did they just add the extra taps for the added bolts?

                          Comment

                          • Terry M.
                            Beyond Control Poster
                            • September 30, 1980
                            • 15573

                            #14
                            Re: Looking at 70 big block. Requesting help where to verify VIN & engine numbers

                            Originally posted by Justin Sibbring (58615)
                            Terry,
                            In order to make a 2-bolt case into a 4-bolt case, did they just add the extra taps for the added bolts?
                            NO, that would be too simple. There are differences in the cylinder case casting, the most obvious of which is above the oil filter mount. I think someone has photos that will be worth much more than my explanation. There were tapped holes in the four-bolt block just above the oil filter presumably for lines to an engine oil cooler. These tapped holes were sealed with pipe plugs in the absence of an engine oil cooler.
                            Terry

                            Comment

                            • Justin S.
                              Very Frequent User
                              • July 3, 2013
                              • 289

                              #15
                              Re: Looking at 70 big block. Requesting help where to verify VIN & engine numbers

                              So that leads me to my next question. Why are the casting numbers the same if the castings are different?

                              Comment

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