273 Rocker Arm modification jig for locking adjusters

Small Block Mopar Engine

  1. daves66valiant

    daves66valiant Hibernation over. 1968 Dart V8 swap in full swing FABO Gold Member

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    I made a quick jig today to flatten the casting surface on these 273 rockers for locking adjuster nuts. As you can see the original castings are way off

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    Measured the rocker shaft and it was .87”. It just so happens a craftsman 5/8” deep socket is also .87”. Well I drilled a 7/8 in hole in some straight scraps and the socket fit snug. Then I squared everything up to the disc sander.

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    I screwed in the adjuster nut and then flipped the locking nut. I referenced it to the flat surface of the sanding disc
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    I set up a couple of fences to keep things squared up. Went through all 16 rockers in about 20 minutes carefully checking each locking nut. Pretty happy with this set up.
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    • brian6pac

      brian6pac Well-Known Member

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      I made a adapter for my lathe that cuts them perfectly flat.
       
    • pishta

      pishta I know I'm right....

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      brilliant! Chuck a lifter in a 1" drill and reface it on a concave wet wheel. I saw a Sioux or Black & Decker valve grinder that had a lifter facer attachment on it. So cool.....
       
    • RustyRatRod

      RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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      Nice job!
       
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      • j par

        j par Well-hung Member

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        I remember when triple-R told me I had to get a flat surface on mine and I just put mine in a vise and used a file and gently made them nice and flat by hand. But this looks a lot more precise.
         
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        • rustycowll69

          rustycowll69 Well-Known Member

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          yeah, I got one of those attachment jigs on my Sioux valve refacer. It does a great job.

          I made an arbor for my lathe to face the top of the rocker arm threaded end. I sort of cut threads on to the end of like a 5/8" drill rod, and I chuck the other end of the rod up into a 3 or 4 jaw, then I just thread the rocker onto the threads, rocker top facing lathe tailstock, until it bottoms out, then face the rocker off until it cleans up. Super easy, super quick, and the facing is exactly 90 degrees to the thread centerline.
           
        • daves66valiant

          daves66valiant Hibernation over. 1968 Dart V8 swap in full swing FABO Gold Member

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          Lathe would be nice to have. I’m running out of space already in my garage. Wifey has to have room for her car. Otherwise, I’d have more tools :)))

          I’m happy with how everything squared up. Simple jig for anyone who has a disc sander of any size. Mine happens to be a 12”. I’m sure it would work on a smaller disc sander as well
           
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          • nm9stheham

            nm9stheham Well-Known Member

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            A great example of how a lot of good things can be done with simple tools. Thanks for the pix!
             
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            • '63GT

              '63GT Well-Known Member

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              You're exactly right.. Too much emphasis is focused upon the 'tool', instead of the 'know how'.
               
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              • Wyrmrider

                Wyrmrider Well-Known Member

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                Reminds me of "adjusting" the lifter buttons on an E Jag on the grinder
                Great Idea and a must do
                the old rockers had interference jam adjusters which took a special tap PITA
                 
              • crackedback

                crackedback FABO Gold Member FABO Gold Member

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                Nice piece of "Hillbilly Engineering"! Good job.
                 
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                • daves66valiant

                  daves66valiant Hibernation over. 1968 Dart V8 swap in full swing FABO Gold Member

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                  Okie style lol
                   
                • gzig5

                  gzig5 FABO Gold Member FABO Gold Member

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                  If you don't have a disk or belt grinder, turn the fixture on its side and mount a grinding disk in the drill press. Will go a little slower due to less disk surface speed, but it will make it happen. Of course if you are a caveman, a file will be sufficient. :poke:
                   
                • Jadaharabi

                  Jadaharabi FABO Gold Member FABO Gold Member

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                  .
                  Just out of curiosity anybody have a way to resurface your hydraulic lifter faces?
                   
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                  • Mopar Sam

                    Mopar Sam Well-Known Member

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                    Rustycowl, can you post a picture of this?
                     
                  • rustycowll69

                    rustycowll69 Well-Known Member

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                    I don't know how to post a picture on here.
                     
                  • Mopar Sam

                    Mopar Sam Well-Known Member

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                    OK,I don't either.
                     
                  • DesertRat

                    DesertRat FABO Gold Member FABO Gold Member

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                    I am going to use this method to prep mine for the new Smith Brothers adjusters I have on the way.
                     
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                    • pishta

                      pishta I know I'm right....

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                      see post #3
                       
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                      • toolmanmike

                        toolmanmike FABO Staff Staff Member FABO Gold Member

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                        Click on "Upload photos" next to "post reply" . There should be a option to your photo file. Find your photo and click on it. It should load on your screen. Then click "post reply".
                         
                      • toolmanmike

                        toolmanmike FABO Staff Staff Member FABO Gold Member

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                        Sometimes I wish I had an old valve/seat grinder.
                         
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