Educate me on 5.9 Magnum Roller Rockers

Discussion in 'Magnum Engine Swaps' started by Scottd9990, Dec 6, 2017.

  1. Scottd9990

    Scottd9990 Well-Known Member

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    I am interested in Roller Rockers for my 5.9 Magnum engine (1999) I have a mild build with EQ Heads, Comp Cam (506 lift) Airgap intake, Dougs Headers! Educate me on best roller rockers for Magnum 5.9. I see the Hughes Engines sets. Pretty Expensive!! Looking best bang for buck.

    Scott
     
  2. Lelo Dart

    Lelo Dart *

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    If your OE are in good condition you can use those.
    I think the ones I got were Melling brand not sure though.
     
  3. Krooser

    Krooser Reform School Graduate

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    Some food for thought....

    roller rockers vs contact tip rockers - Speed Talk
     
  4. jbc426

    jbc426 Well-Known Member

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    Give Mike a call at B3 Racing. He knows rocker arms and proper installation.
    B3 Racing Engines LLC - Performance Engine Building and Mopar Valvetrains
     
  5. dartfever

    dartfever Well-Known Member

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    Unless you are looking to increase the ratio, I'd spend your money elsewhere. If you are at .506 lift with your cam now, and should be 1.6's with the magnums, going to 1.7's might require some work on the heads to accommodate the higher lift of .537.
     
  6. Scottd9990

    Scottd9990 Well-Known Member

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    Not really looking to go more lift, just less friction. Already using roller cam (Comp) and 1.6 ratio rockers (Stock) which work very well up to 6200 or so. Just looking to free up some extra HP if I go roller rockers. Yes? No? Also looking at possible E85 conversion. I heard from local Drag guys they are getting 30-40 RW HP jumps on E85.

    My combo works great, but looking for a bit of an edge for next season racing SCCA CAM Class.
     
  7. dartfever

    dartfever Well-Known Member

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    Need to watch the latest engine master episode. Very interesting outcome.
     
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    • RustyRatRod

      RustyRatRod Just another dumbass. FABO Gold Member Technical Editor

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      The ones from Hughes are the best, IMO. Just look at them. That's all it should take.
       
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      • 70aarcuda

        70aarcuda Master Hoader of SBM FABO Gold Member

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        hughes makes a very nice set that converts to a shaft style rocker.....but a 3/8 stud small block chevy rocker will work on a magnum. A stud 5/16 conversion to 3/8 stud is used....then pick your favorite brand of rocker...aluminum or stainless
         
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        • Scottd9990

          Scottd9990 Well-Known Member

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          Thanks!!!
           
        • Walker434

          Walker434 Well-Known Member

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          I've been researching this as well. I like the looks of the Hughes the best but man are they expensive! $760. They are 1.65 ratio so I would need to make sure I have enough piston to valve clearance for that. My cam is currently .507/.513 so 1.65 would take that to .523/.530.

          I've also looked at Harland Sharpe 1.60 ratio for around $430. Here is a here is a pic of the Hughes set

          image.jpg
           
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          • 318willrun

            318willrun Stomper 4x4... we kept energizer in business FABO Gold Member

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            I'm running Harland Sharp 1.7 ratio rollers on my 360 mag.
             
          • Walker434

            Walker434 Well-Known Member

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            Stock Pistons? What heads? Cam specs?
             
          • 318willrun

            318willrun Stomper 4x4... we kept energizer in business FABO Gold Member

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            If you mean me, I put them on my Ram, stock 360 mag. Should have added about .030 lift. They are silent, on the coldest days.
             
          • Scottd9990

            Scottd9990 Well-Known Member

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            My cam is close to yours so think I will stay with
            1.6 rockers. Still have not decided yet.
             
          • RustyRatRod

            RustyRatRod Just another dumbass. FABO Gold Member Technical Editor

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            Lift is not what you need to be concerned with as far as piston to valve clearance. It's the duration. It's not the how much, but when the valve is open. If you have clearance with the 1.5 you will have clearance with 1.65.

             
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