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Engine Numbers Game

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  • Chuck R.
    Expired
    • April 30, 1999
    • 1434

    Engine Numbers Game

    Ok, heres what Iv'e got. I can't wait for the answers:(

    Pad numbers = C6B(or3) 140203 13 TXD
    Intake = 346250 K2
    Heads = 3795896 T(with triangle next to it) GM7 D225
    Carb. = Quadrajet 17080213 1 2909 CPX

    My best guess is that it's out of a truck

    Appreciate any information,

    Chuck
  • Clem Z.
    Expired
    • January 1, 2006
    • 9427

    #2
    Re: Engine Numbers Game

    TXD is a 350 truck engine

    Comment

    • Joe L.
      Beyond Control Poster
      • February 1, 1988
      • 43193

      #3
      Re: Engine Numbers Game

      Chuck-----

      The block is from a 75-77 truck engine which was rated at 160 or 165 hp. This particular engine was manufactured in Canada at the St. Catherines, ONT engine plant.

      The heads must have been replaced at some point. I think that the 3795896 castings were long out-of-production by the 1975-77 period. These hads were used on 62-65 Chevrolet 283 and 327 cid engines of the lower performance variety. They have 1.72/1.50 valves and a 60 cc, nominal, combustion chamber. The original heads for this engine likey were 76 cc heads. If so, and if these heads are used with original 75-77 pistons, that will result in a significant increase in compression ratio.

      This would still represent an adequate engine for your application. It might be capable of 300 hp with the right camshaft.
      In Appreciation of John Hinckley

      Comment

      • Chuck R.
        Expired
        • April 30, 1999
        • 1434

        #4
        Re: Engine Numbers Game

        So Joe...... can I assume (I know a bad word) that this is a four bolt main power plant?

        Comment

        • Joe L.
          Beyond Control Poster
          • February 1, 1988
          • 43193

          #5
          Re: Engine Numbers Game

          Chuck-----

          I really doubt that it is. Although many trucks did get the 4 bolt blocks, it was mainly MD and HD trucks and not light duty types (i.e. pick-ups). It is a possibility, though, but the only way to tell is to take the pan off and look. The blocks were exactly the same for both 2 and 4 bolt. It just depended on which 3 center caps were installed. The GM #3956686 4 bolt bearing caps are discontinued. However, aftermarket caps are available and are much stronger than stock GM. Get the caps, have the block line-honed, and you've got better-than-original. You can also get original caps off of a donor engine that has met an unkind fate.
          In Appreciation of John Hinckley

          Comment

          • Chuck R.
            Expired
            • April 30, 1999
            • 1434

            #6
            Re: Last question, I promise

            At least on this bad boy.

            Would the tapping for the clutch ball stud be there for this gender block?

            I can't tell as the rear dump exhaust manifold covers this area in the picture.

            Comment

            • Clem Z.
              Expired
              • January 1, 2006
              • 9427

              #7
              Re: Engine Numbers Game

              i can not say for sure about this engine but every 4 barrel carb truck engine i took apart had 4 bolt mains.

              Comment

              • Clem Z.
                Expired
                • January 1, 2006
                • 9427

                #8
                Re: Last question, I promise

                what is the casting number on the driver side bell housing flange?

                Comment

                • Clem Z.
                  Expired
                  • January 1, 2006
                  • 9427

                  #9
                  PS i should have posted "350 ci truck engines" *NM*

                  Comment

                  • Chuck R.
                    Expired
                    • April 30, 1999
                    • 1434

                    #10
                    Re: I'll have to go back to the well

                    To find out what the casting number is on the driver's side flange.

                    If it's there, For $100.00 it sounds like it's well worth the gamble.

                    Thank you Clem and Joe for your help and insight.

                    I just can't say enough good things about the help you folks volunteer to help us (me) who are less than adept at getting to the bottom of these questions.

                    If either of you ever need an expert opinion on lawn mower engine tune ups, I'm your man by gum!

                    Really though thanks again,

                    Chuck

                    Comment

                    • Joe L.
                      Beyond Control Poster
                      • February 1, 1988
                      • 43193

                      #11
                      Re: Last question, I promise

                      Chuck-----

                      The 3970010 definitely has the tapped boss for the clutch crossshaft ball stud used for all 63-81 Corvette applications.
                      In Appreciation of John Hinckley

                      Comment

                      • Joe L.
                        Beyond Control Poster
                        • February 1, 1988
                        • 43193

                        #12
                        Re: I'll have to go back to the well

                        Chuck----

                        It's worth at least $100 as a core, alone.
                        In Appreciation of John Hinckley

                        Comment

                        • Joe L.
                          Beyond Control Poster
                          • February 1, 1988
                          • 43193

                          #13
                          Re: I'll have to go back to the well

                          Chuck-----

                          Another thing is this: for an engine like this, even if you were to add a better cam (like a 260 or 270 dual profile set-up for about 5,500 rpm max hp)and better induction system, the power levels that you're going to be able to achieve with it are WAY BELOW anything that's going to strain a 2 bolt block. The 2 bolt will be more than adequate. If you want to do things that are going to get this engine above the 2 bolt power limits, you're going to have to go way into the engine and remove it for further work/parts installation/machining. Should you get to this point and find that the block is not currently 4 bolt, you can easily add the 4 bolt main caps at that time. Like I say, the 3970010 is all set up to accept 4 bolt caps with no problem, at all.
                          In Appreciation of John Hinckley

                          Comment

                          • Chuck R.
                            Expired
                            • April 30, 1999
                            • 1434

                            #14
                            Re: I was told the exact same thing

                            by my local performance machine shop.

                            All I'm after is enough respectable horse power to pull a good power curve when those C-5s and sixes pull up next to me at the lights and jab the throttles

                            Thanks again to both of you for the input and extra leg work to educate this engine layman.

                            Chuck

                            Comment

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