Rocker arms for 408 build

Small Block Mopar Engine

  1. 12many

    12many Well-Known Member

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    Im running older versions of the Comp Cams brand (red anodized) 1.6 roller rockers, studs, guide plates and oil-thru pushrods. All top quality parts, not sure about the negative opinions, maybe it’s just Chevy engineered parts on a Mopar, and the question asked on a Mopar site= Negatives....but elsewhere likely different. I’d forget the notion of always shopping for cheap prices, cheap is cheap, think of it as another “you get what you pay for” scenario. You got three options on Magnum style: oem, Mopar Performance, or a setup by any number of brands such as what I run. There’s well known quality: Crane, Lunati, Scorpion, Comp, Howard's. That’s it. Odd name no name pro-form or don’t even......
     
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    • mbaird

      mbaird mbaird

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      What I meant by cheap was under 500$
      But again ... I have not researched the subject all that much.
       
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      • 12many

        12many Well-Known Member

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        You should easily be able to source rockers, studs, guide plates for that, maybe even pushrods especially using a discount code, if the timing is right:thumbsup:
         
      • mopowers

        mopowers Well-Known Member

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        PRW stainless 1.6's. That's what Brian at IMM recommended to me when I bought a set of his RHS heads. They're a great 'budget' rocker arm once you inspect the hell out of them and spend the time set their side clearances.
         
      • Idaho

        Idaho FABO Gold Member FABO Gold Member

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        Did you have any valve contact trouble?
        IIRC those are not adjustable, correct?
         
      • rumblefish360

        rumblefish360 So close, yet so far away FABO Gold Member

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        All Crane rockers are adjustable because they do not make stamped steel replacements
         
      • Idaho

        Idaho FABO Gold Member FABO Gold Member

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        Thanks. I was forgetting they are stud mounted using polylocks. I've read they can be a problem getting the right thread exposure as well.
         
      • Idaho

        Idaho FABO Gold Member FABO Gold Member

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        Nothing I've read was about using Chevy parts. It's about poor contact patterns.
        Of course the bad experiences get written up. Maybe they are fine most of the time?
         
      • mbaird

        mbaird mbaird

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        If Chevy/Ford rockers work for the magnum application why arent they available packaged up with the proper components by anyone ? Seems they would sell like hot cakes !
         
      • rumblefish360

        rumblefish360 So close, yet so far away FABO Gold Member

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        The Chevy rockers are available as you wished for.

        Now where to find them or how it gets done, IDK, but I’d like to know the details.
         
      • mbaird

        mbaird mbaird

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        They are ? Where ?
         
      • rumblefish360

        rumblefish360 So close, yet so far away FABO Gold Member

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        :rofl:
        I have seen them in the master by didn’t take note or care
         
      • mbaird

        mbaird mbaird

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        If I could get a full setup for 250$ that works well I would go for that. Adjustable ones... but if I have to jack around and piece meal components for 350 I would just buy HS adjustables for 500$.
         
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        • 12many

          12many Well-Known Member

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          I’m pretty sure you have to piece it together still as I did a few years ago. Readily available Comp Cams has the exact studs and correct guideplates that fit the Magnum or EQ heads. You order custom length pushrods compatible with guideplate use. Crane looks too also offer specific pieces but the guideplate setup looks more complicated so as to be able to use regular pushrods vs. using “guideplate compatible pushrods” and simple guide plates such as from Comp. Could probably use Isky adjustable guideplates, but Comp will likely be at a much better price than any others for same quality. That’s why I went with all Comp, best value and readily available. Here’s some Crane listings:

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        • rumblefish360

          rumblefish360 So close, yet so far away FABO Gold Member

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          Awesome! Thanks 12!
           
        • Idaho

          Idaho FABO Gold Member FABO Gold Member

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          I'm kinda puzzled here. No polylocks, how do they adjust?
          Price includes rocker arms.

          comp cams rocker kit.png
           
        • Idaho

          Idaho FABO Gold Member FABO Gold Member

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          Here's the PRW set. Summit sells a stud / guideplate set separate.
          Since Brian at IMM uses them I imagine things line up ok. Maybe :)
          Lookin at them I think stock valve covers may fit.
          Then there's the question of stud girdles.
          A local machinist I spoke to today insists upgraded rockers and girdles are required. No big surprise.

          prw rockers.png
           
        • Idaho

          Idaho FABO Gold Member FABO Gold Member

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          Aluminum.
          I'm going to check the price to have the studs drilled and tapped to 3/8.

          harland rockers.png
           
        • Wyrmrider

          Wyrmrider FABO Gold Member FABO Gold Member

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        • Idaho

          Idaho FABO Gold Member FABO Gold Member

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          Harland pedestal. I presume 5/16, no stud conversion.
          Does a 5/16 to 3/8 stud conversion add stiffness?

          harland pedestal jegs.png
           
        • 12many

          12many Well-Known Member

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          Been covered in the past:Chevy Roller Rockers the stock 5/16” stud mounting is IMO fine as is for most street pressures and rpms. I’d research as much as possible on any reports on stud breakage with the 5/16”....likely not going to find any but you never know. And then if you did, what spring pressure, rpm, the geometry correct? You could go to 3/8” but I’d be checking how much cast pedestal material will remain on each pedestal before enlarging. 7/16“ would be too big for the pedestal.
           
        • Idaho

          Idaho FABO Gold Member FABO Gold Member

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          Rocker arm nirvana.
          Comes with clear valve covers.

          hughes shaft.png
           
        • Idaho

          Idaho FABO Gold Member FABO Gold Member

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          Thanks for bringing me back to earth... :)
           
        • mbaird

          mbaird mbaird

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          I think the 5/16 is fine for our builds.
          Solid roller , high rpms and big spring pressures would be a different story.
           
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          • 67 gt

            67 gt A Wog boy who loves his Mopars ! FABO Gold Member

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            Had good sweep across the face tip and they were adjustable as I was running a solid flat tappet.La bottom end comp cams 803 lifters with the oil hole . Ball to ball Oil through push rods. Purchased rockers, guide plates and studs as a kit from Summit.
             
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