69 Prototype LT1 Revisited - NCRS Discussion Boards

69 Prototype LT1 Revisited

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  • Chuck G.
    Extremely Frequent Poster
    • May 31, 1982
    • 2029

    69 Prototype LT1 Revisited

    Here's a synopsis of my previous post. I received more info today. This is a 69 coupe in the hands of the second owner, who bought it from a Chevrolet engineer.

    1. 1969 VIN 182XX. It's a coupe

    2. Marlyn Stoven was the original Chevrolet engineer owner. He was the college roommate of the current owner.

    3. Mr. Stoven wrote a letter in June of 1990 stating the history of the car. He's still alive, just retired from Ford.

    4. Block casting number is "386". Casting date is H188. Heads are "291", casting dates are G58 on both.

    5. Engineering numbers 19634-9-B is stamped on the stamp pad, and then "chisel marked" out. That same number is also stamped on the front of both heads. V0218HW is overstamped over the "chisel marked out" engineering numbers.

    6. The current owner recently carefully "tore down" the motor as it was using oil. All of the pistons still have original engineering weight numbers marked on them. The crank has extra balance pads welded on several of the counterweights. The cam is a "fuel injection" solid lifter cam.

    Here's the story. This car was used for the express purpose of being converted to a LT-1 for final validation of the vehicle cooling package. The engine internals were converted, and an LT-1 "high rise" hood was installed. After a successful test, Mr. Stoven purchased the vehicle, at which time the the engine number was changed from an engineering sequence to a production number. Since the vehicle was purchased as an engineering vehicle and subsequently upgraded at engineering, the vehicle was not titled prior to the engineers purchase. Therefore the vehicle as initially titled included the LT 1 prototype engine as installed by Chevrolet. Thoughts and comments? Thanks. Chuck
    1963 Corvette Conv. 327/360 NCRS Top Flight
    2006 Corvette Conv. Velocity Yellow NCRS Top Flight
    1956 Chevy Sedan. 350/4 Speed Hot Rod
  • Duke W.
    Beyond Control Poster
    • January 1, 1993
    • 15610

    #2
    Re: 69 Prototype LT1 Revisited

    Was the LT-1 ever EPA certified to meet '69 MY emissions? If not I'm surprised that GM would sell a prototype car, as this would be illegal and make them subject to civil fines.

    Maybe policies and procedures back then were a little loose, but I don't think this would happen nowadays.

    "Fuel injection cam" is pretty meaningless. Can you get the markings off the cam so we can check if it's a 3972178 cam. Also, I'd be interested in the lifter type as with the '70 LT-1, GM switched back to the old 57-63 "edge orifice" type from the "piddle valve" type that were used on mechanical lifter SBs from 64-69 and all mechanical lifter BBs.

    The edge orifice type is one piece and the piddle valve type is two piece held together with a snap ring, so they look like a hydraulic lifter.

    Duke

    Comment

    • Art A.
      Expired
      • June 30, 1984
      • 834

      #3
      Re: 69 Prototype LT1 Revisited

      My comments----A man convinced against his will is a man of the same opinion still.

      Art

      Comment

      • Chuck G.
        Extremely Frequent Poster
        • May 31, 1982
        • 2029

        #4
        Re: 69 Prototype LT1 Revisited

        I just received some further info. There is no VIN derivitive stamped on the stamp pad. The V0218HW is stamped below and "over" the chisel marked engineering numbers. The current owner worked at Chevrolet Engineering (Proving Grounds) and the Tech Center during the summers, and realizes that it was not their practice to leave a motor like this in the car. ???? Chuck
        1963 Corvette Conv. 327/360 NCRS Top Flight
        2006 Corvette Conv. Velocity Yellow NCRS Top Flight
        1956 Chevy Sedan. 350/4 Speed Hot Rod

        Comment

        • Art A.
          Expired
          • June 30, 1984
          • 834

          #5
          Re: 69 Prototype LT1 Revisited

          Chuck, Can you have either of the past two owners---apparently both ex Chevrolet Engineering employees, tell us what this statement means: "for final validation of the vehicle cooling package"????? Federal, Local, State, legal, Engineering or what?

          Art

          Comment

          • Art A.
            Expired
            • June 30, 1984
            • 834

            #6
            Re: 69 Prototype LT1 Revisited

            Chuck, Can one of the past owners verify that THIS motor was actually in the said vehicle when the first owner purchased it? Could the motor have been slipped under the fence at Engineering and later installed in this vehicle?-----it happened more often than you might think.

            IMHO This vehicle is not now nor never was a PROTOYPE. It was a PRODUCTION vehicle that Engineering put a TEST engine in for Engineering evaluation---IF, WHAT YOU HAVE SAID IS ALL TRUE.

            Art

            Comment

            • Loren L.
              Extremely Frequent Poster
              • April 30, 1976
              • 4104

              #7
              Art, make a note to check the WO

              # 19___-? against the files if you get the chance.

              Comment

              • Art A.
                Expired
                • June 30, 1984
                • 834

                #8
                Re: Art, make a note to check the WO

                Loren, It's on my agenda, but I don't know when I can get to it?

                I won't make it a priority because I think they are trying to make a silk purse from a sow's ear.

                Art

                Comment

                • Chuck G.
                  Extremely Frequent Poster
                  • May 31, 1982
                  • 2029

                  #9
                  Re: 69 Prototype LT1 Revisited

                  Hi Art. I'll ask the question. I also want to say that I have no personal knowledge of this car. I don't even know where it's located. I received an EMail asking for assistance, so I'm trying to help.

                  I assume that the car was "built up" to LT1 specs to test/validate? the cooling system. I don't know what the term "validate" means in "legal" or "engineering testing" terms, but that is the word that has been used in two EMail's I've received. Chuck
                  1963 Corvette Conv. 327/360 NCRS Top Flight
                  2006 Corvette Conv. Velocity Yellow NCRS Top Flight
                  1956 Chevy Sedan. 350/4 Speed Hot Rod

                  Comment

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