Rocker Arm Shim Alternative?

Big Block A body Tech

  1. Red_Duster

    Red_Duster Well-Known Member

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    Hey guys. In a bit of a pickle. Got my Promaxx heads all bolted up just in time for the New Years races. Only problem is my rocker arm alignment is a little off from what it was and I can’t order any and get them here in time. Doesn’t seem like there is much to them, is there a hardware store alternative? anything come to mind?
    Anyone in Northern California have a pack or two to sell?
     
  2. Demonic

    Demonic Well-Known Member

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    Cut up a soda can? How far is it off?
     
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    • Donnie514

      Donnie514 FABO Gold Member FABO Gold Member

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      O.M.G.
       
    • famous bob

      famous bob mopar misfit FABO Gold Member

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      I did the soda can for shim thing . I`m thinkin springs on the free side like 426 hemi. Or the slide clamps , where u set the pedestal side and just run the clamp up to the rocker , much like the springs would b done .
      Sure would be easier than shims and spacers , that was the worst bitch of my build I think. Would have to try it and look at the oil control tho----
       
    • famous bob

      famous bob mopar misfit FABO Gold Member

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      OMG what? You never made anything ?
       
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      • Tinmannz

        Tinmannz Well-Known Member

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        My Ace hardware store sells brass shim stock in .015-.025 thicknesses. Perhaps yours does as well.
         
      • mopowers

        mopowers Well-Known Member

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        Valve spring shims should work. Any machine shop in your area should have them on hand.
         
      • motorpirate

        motorpirate serial mopar owner

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        I have seen spark plug gaskets used as rocker shaft shims before....
         
      • pishta

        pishta I know I'm right....

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        1 ID AL tube, cut (very carefully and grind) to fit? How much slop we talking? on an LA there is little slopt to begin with as the shaft retainers pretty much take up all the slop. I had to use maybe 6 .010 shims total when I got my 340 mechanicals snug and that was probably overkill.
         
      • 67Dart273

        67Dart273 FABO Gold Member FABO Gold Member

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        Nothing wrong with STEEL soup cans either. "Aircraft snips." Red/ left/ port the "short words" go together, and green/ right/ starboard "the long words" all go together

        16095_2.jpg
         
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        • oldkimmer

          oldkimmer FABO Gold Member FABO Gold Member

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          How much outta wack r u talking. Post a pic. Kim
           
        • Demonracer

          Demonracer 71 Demon 00 Ram 16 Chrysler 300S 05 Caravan FABO Gold Member

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          Definitely need pictures to see how far out the alignment is.
           
        • Donnie514

          Donnie514 FABO Gold Member FABO Gold Member

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          All the rocker shaft shims I have ever seen or used were made of hardened steel, not a piece of crap that could disintegrate.
           
        • MOPAROFFICIAL

          MOPAROFFICIAL Well-Known Member

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          Mike at B 3 racing could fix you up.... but... if you're in a hurry use copper pipe

          You can cut it, split it, tap it flat, drill the hole and then hammer one side thinner...trim and make 9 more.
           
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          • Red_Duster

            Red_Duster Well-Known Member

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            Ok, so I got some shims at ace and did one rocker. First picture is how far off enter the adjuster we’re to the rods. I shimmed it over. Second picture shows after shimming that now the rocker isn’t centered over the valve, and this one is the worst.

            merit: pics uploaded reverse of what I stated.

            8ECC6B84-B92F-4C18-B9C3-E7C5D3DBB5D3.jpeg

            7FE0B7C1-BB3A-4D77-AAF6-CAA9F1FFB4E8.jpeg
             
          • oldkimmer

            oldkimmer FABO Gold Member FABO Gold Member

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            We’re those supposed to have offset rockers? Kim
             
          • Red_Duster

            Red_Duster Well-Known Member

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            The manufacturer said stock rockers would be fine, and since these cranes were on the 906s, I figured that would work. Is it too far off center on the valves now to run it?
             
          • Demonic

            Demonic Well-Known Member

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            You might have to grind a little for pushrod clearance perhaps. I know that means a disassembly and cleaning.
             
          • oldkimmer

            oldkimmer FABO Gold Member FABO Gold Member

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            I wouldn’t run it like that. R u sure ur rockers r in the proper position as in intake on intake and ex on ex? Can u post a pic from farther back so we can see the whole set up on the 1 head? Kim. Any progress?
             
            Last edited: Jan 4, 2020
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