273 commando Build

Discussion in 'Small Block Mopar Engine' started by stroker402, Apr 3, 2018.

  1. stroker402

    stroker402 1968 dart GTS convertible

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    I have those also . They are good gaskets, had them on the engine that blew up.
     
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    • 4spdragtop

      4spdragtop FABO Gold Member FABO Gold Member

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      Pics 4.140 bore and 0.041 NOT compressed.

      20180405_112928.jpg

      20180405_113001.jpg
       
      Last edited: Apr 16, 2018
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      • krazykuda

        krazykuda FABO Gold Member FABO Gold Member Technical Editor

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        Use the ones with the smallest hole for maximum compression...
         
      • toolmanmike

        toolmanmike FABO Staff Staff Member FABO Gold Member

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        Well that sucks. Sorry you were mis informed about your purchase. They do look like they are nos with correct part numbers and packaging but are definitely not steel shim or small bore. Can you return them?
         
      • stroker402

        stroker402 1968 dart GTS convertible

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        these nos gaskets have the smaller hole so that is probally what I will use then.
         
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        • stroker402

          stroker402 1968 dart GTS convertible

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          I can return if I want . since these nos gaskets have the smaller bore this would probally be the better choice what do you think tmm ?
           
        • toolmanmike

          toolmanmike FABO Staff Staff Member FABO Gold Member

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          I would use them .
           
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          • stroker402

            stroker402 1968 dart GTS convertible

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            Thanks tmm !
             
          • stroker402

            stroker402 1968 dart GTS convertible

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            soon as it warms up here again it's back to the garage again. time to slide the Isky cam in next .
             
          • krazykuda

            krazykuda FABO Gold Member FABO Gold Member Technical Editor

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            Are you going to degree it?
             
          • stroker402

            stroker402 1968 dart GTS convertible

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            nope......... she is going in straight up . the cam has 2* already built into it . my-commando-cam-specs-jpg.jpg my-coammdo-cam-specs-ii-jpg.jpg
             
            Last edited: Apr 16, 2018
          • stroker402

            stroker402 1968 dart GTS convertible

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            I read somewhere that you never want the head gasket bore ring to come close to the edge of the cyl bore.
             
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            • toolmanmike

              toolmanmike FABO Staff Staff Member FABO Gold Member

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              That makes sense. I never saw the original bore dimensions of the originals. Like a dumb azz, I threw mine away.
               
            • krazykuda

              krazykuda FABO Gold Member FABO Gold Member Technical Editor

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              Degreeing it will also verify that it's installed in the proper position... Not to advance or retard it...
               
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              • krazykuda

                krazykuda FABO Gold Member FABO Gold Member Technical Editor

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                You need to make sure that there's enough clearance so the piston won't hit it...
                 
              • ddartdude

                ddartdude Well-Known Member

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                I think these head gaskets are what was on my first D/Dart. On my tablet, I measured the silhouette left on my block with the bore set at 3.63. The seal ring was just about 4.00. The material looks like it would compress quite a bit. So I'd say the NOS gaskets that you just got are the correct ones. The 1198 stamp must be the date code ... 119 day of 1968?

                Just did a check on the head gasket on "The Politician" and it's just metal and about 0.023". Just enough of it was sticking out of the front to mic it.

                Did a part number check on MyMopar of the 2536757 head gasket and nothing came up. They have a database of over 120,000 Chrysler part numbers.
                 
                Last edited: Apr 17, 2018
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                • toolmanmike

                  toolmanmike FABO Staff Staff Member FABO Gold Member

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                  This has been a very interesting conversation about original head gaskets. Stroker402 needs to continue building his 273 with the gaskets he has and may be someone will take a virgin 273 apart that has steel shim gaskets and we can get a bore measurement and put the myth to rest. I will be excited to hear this thing run. The cam is like the E-4 but more lift. Don't forget videos.
                   
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                  • stroker402

                    stroker402 1968 dart GTS convertible

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                    Barracudadave67 has steel head gaskets that came off his 66 barracuda Formulas S. For some reason unknown, they are very distorted near the valve areas as you can see in the pics. Also the bore size of gaskets is larger like all the others we have seen . not 3.636" bore size . 20180404_150529-640x360-jpg.jpg 20180404_150622-640x360-jpg.jpg
                     
                  • stroker402

                    stroker402 1968 dart GTS convertible

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                    barracudadave67 wrote > Here is a pic of the steel shim gaskets, for the 273 HP. They mic out at .0245-.025, This is on one, or two of the clean spots. The center tab has a PN of 2536757, and the right tab has a# of mc 6681, verticlaly, on it.Hope this helps.
                     
                  • stroker402

                    stroker402 1968 dart GTS convertible

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                    Thanks tmm !
                     
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                    • krazykuda

                      krazykuda FABO Gold Member FABO Gold Member Technical Editor

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                      I have a couple of commando 273's that I haven't torn down yet... Not sure if they still have the stock head gaskets or not...

                      I don't know when I will get around to tearing them down, but this thread has me wondering.... :BangHead:
                       
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                      • stroker402

                        stroker402 1968 dart GTS convertible

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                        Yes !
                        Mopar never did have a set plan on things . They always had to change things just a little bit so nothing fit the next later. go figure .
                         
                      • 65Val

                        65Val Average Length Member

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                        Here's the original shim head gaskets from my (at the time) virgin 273 in my Dart...

                        IMG_2127 (Small).JPG

                        IMG_2129 (Small).JPG
                         
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                        • stroker402

                          stroker402 1968 dart GTS convertible

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                          I think this is a more recent gasket from mopar. larger number and date> 1968? what do these measure on the bore ?
                          Thanks !
                           
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                          • toolmanmike

                            toolmanmike FABO Staff Staff Member FABO Gold Member

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