Rocker arm play

Discussion in 'Small Block Mopar Engine' started by moparker, Jun 11, 2018.

  1. moparker

    moparker Well-Known Member

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    Should there be any side to side movement on stock rocker arm assemblies?
     
  2. 72Dart6pack

    72Dart6pack Harder Better Faster Stronger.

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    There is a spec for side to side play. Like .030 but don't hold me to that number. Other guys will chime in.
     
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    • moparker

      moparker Well-Known Member

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      I hope. I'm sure that is the irritating ticking noise I'm hearing. My retainers don't look that bad to me. I think I have more play than that.
       
    • Plymouth 65

      Plymouth 65 Floorable Deplorable

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      Stock cam and valve springs? 65'
       
    • yellow rose

      yellow rose Doctor of Thinkology.

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      .030 is ok but if you are AR about it you can shim them to .015. That's what I do because I'm retarded like that. If you have to shim to .030 why not close it up a bit more.
       
    • 72Dart6pack

      72Dart6pack Harder Better Faster Stronger.

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      You do want some side play. When the parts get warm they grow a little. Someone will know the spec. Just hold tight.
       
    • moparker

      moparker Well-Known Member

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      Not stock can and valve springs. I have a Lunati can with double springs.
       
    • MOPAROFFICIAL

      MOPAROFFICIAL Well-Known Member

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      I share the same retention...lol... I try for .010-.015... but once you tighten it back down and torque it you usually find that there's always a lil extra still.

      Op, Too much on a solid high lift and you will here the rocker hit the one next to it
       
      Last edited: Jun 11, 2018
    • moparker

      moparker Well-Known Member

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      My cam is hydraulic but, is on the larger side. I was wondering if that had anything to do with it. Could someone post pics of the shims and exactly where they placed them?
       
    • flyfish

      flyfish C8H18+N2O = :-D

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    • moparker

      moparker Well-Known Member

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    • IQ52

      IQ52 Well-Known Member

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      • moparker

        moparker Well-Known Member

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        So it's ok to use the spacers on a hydraulic set up? All the spacers kits say they are for solid cams.
         
      • Wyrmrider

        Wyrmrider Well-Known Member

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        Big Hyd cam
        check for stem tip wear and rocker pad
        think lash caps to spread out the load
        when shiming try to line up the rockers on the tips
        what does the tip wear pattern look like when your die the stems and turn the motor over? you want as narrow as possible
        throw some adjustable pushrods on it and adjust shaft height till you get narrowest pattern then check against your pushrod length- watch for leaker bleed down or use a solidized lifter--if new lifters use the MAgnum/ AMC style and hollow pushrods to save those pushrod cups in the stock rockers
        do the complete mid lift geometry drill- you may need shims under the shafts
        not only ok to use with hyd but necessary with a big cam
         
        Last edited: Jun 12, 2018
      • nm9stheham

        nm9stheham Well-Known Member

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        Spacers are fine for either. The existing spacers under the bolt heads can be moved around too.

        I have not ever seen a spec in this for the stamped rockers BTW. And not trying to be obtuse, but there are much more likely causes for this tapping/ticking, so make sure you look at everything:
        - a soft hydraulic lifter
        - pushrods hitting the sides of the pushrods holes due to high lift (spacers could make this worse)
        - retainers hitting the seals/stem guides for there same reason
        - rocker hitting the baffle on the underside of the valve cover
         
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        • moparker

          moparker Well-Known Member

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          It's definitely not a lifter tick. It could be some of the causes you named. Thanks for all the input.
           
        • nm9stheham

          nm9stheham Well-Known Member

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          And FWIW.... I also suspect the loose side clearance for the stamped rockers has to do with:
          - The way they oil (With the stamped slot in them, there is really not the same oiling out the sides like in machined rockers.)
          - They won't all ride perfectly parallel to each other on the shaft. Being stamped, there is a limit to the parallelism that just can't be as good as a machined part. So some slop is necessary.

          Let us know if this does the trick for your tick.
           
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          • mullinax95

            mullinax95 Well-Known Member

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          • moparker

            moparker Well-Known Member

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            Thanks. A friend of mine who is career mechanic has been doing some research as well. A lot of guys are having this issue. Some have found it was the thickness of the head gaskets causing the problem.
             
          • famous bob

            famous bob mopar misfit

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            agree w/ this ^^^^^^^^^^^^^^^^^^^
            I don`t have stock rockers, and use .010-.012 feelers between each rocker arm, and leave them in while tightening the shaft bolts down. Keeps things more accurate for me.
             
          • MOPAROFFICIAL

            MOPAROFFICIAL Well-Known Member

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            Sometimes you end up grinding on the hold downs to get it just right.
            All the aftermarket rocker assemblies I use come with the black spacers, I think they are about .080 thick.
             
          • nm9stheham

            nm9stheham Well-Known Member

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            Running the hydraulic lifter adjustment out of range?
             
          • moparker

            moparker Well-Known Member

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            Not sure what you mean. If the gaskets are to thick then there won't be as much or any tension or load on the rockers to keep them in place.
             
          • nm9stheham

            nm9stheham Well-Known Member

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            I think this is what you are meaning: There is not a lot of tension and it only comes from trapped oil in the piston that can move inside the lifter. The tension/pressure is pretty constant as the head moves up or down with gasket thickness, but the lifter's piston has a short movement/adjustment range. If the heads lift up too much, the piston can reach its upper stop and then a gap opens up between the lifter's piston, pushrod and rocker.

            But side shims won't change/fix that loose situation.
             
          • moparker

            moparker Well-Known Member

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            That's what I'm gathering as well. Gonna do some measuring soon and get a better idea of what I need to do.