Roller Rockers

Discussion in 'Small Block Mopar Engine' started by dad69dds, Nov 2, 2018.

  1. dad69dds

    dad69dds Well-Known Member

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    72 Duster 340 number matching with j heads wanting to buy some roller rockers not sure what will fit, don't want the best and don't want anything cheap either yes I just put a cam in her that's why im needing one.
     
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    • 70chall440

      70chall440 Mopar or No Car...

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      I am using PRW, seem to be ok.
       
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      • T56MaxTorq

        T56MaxTorq Well-Known Member

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        How much are you willing to spend?

        Don’t forget you’ll need to factor in shafts, a hold down/shim kit for the rockers, and custom pushrods. Not to mention the proper tools to take measurements. This alone will double cost of just buying rockers alone.
         
      • AJ/FormS

        AJ/FormS 367 FormS clone 3.09-1.92-1.40-1.09-.78od 3.55s

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        You didn't say solid-lifter cam, or hi-lift cam,or super HD springs, etc. .......... so what is wrong with using the stock gear?
         
      • Abodybomber

        Abodybomber Breaking street machines , since 1983.....:)

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        Hughes A1 prideful prices , They work... Spring pressures open and on the nose...,helps here...
         
      • j par

        j par Well-hung Member

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        Was it a lumpy cam?
         
      • Garrett Ellison

        Garrett Ellison Amateur driver on public roadway, do not imitate!

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        Budget providing, my personal favorite is the comp cams pro magnum shaft mount, Part # 1622-16, 8650 chrome molybdenum steel, shafts included, but do have to add in hold downs and double ball end push rods. When it comes to street usage, aluminum just isn't steel as far as fatigue life and oil temperature are concerned.
         
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        • 72Dart6pack

          72Dart6pack Harder Better Faster Stronger.

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          I run the same rockers.
           
        • rumblefish360

          rumblefish360 so close yet so far away

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          If your shafts are in good shape;
          Chrysler Small Block

          If you need everything;
          Hughes Engines

          The Comps would be next in line. I have had a set on my Edelbrocks a very long time now.
           
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          • B3RE

            B3RE B³ Racing Engines

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            Research roller rocker geometry before you make a decision on any rocker. You'll be glad you did. Searching the archives on FABO is a good place to start.
             
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            • j par

              j par Well-hung Member

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              I don't understand why everybody can't see the importance of post six? I mean that's what we really need to know correct? to make a good determination?
               
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              • dad69dds

                dad69dds Well-Known Member

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                The j heads are original and the push rods are off set with a left and right rocker u cant run straight rockers because the push rods will rub the head casting with out taking the heads off and doing some modifications on where the push rods go through the head casting hole so a straight roller rocker will not work the cam I put in is a comp cam 20-670-4 474 intake 474 exhaust 280 i/e lift 110 seperation
                 
              • xLURKxDOGx

                xLURKxDOGx "An angel fat, at satan's feast"

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                AAR/TA heads? I would guess that you already have nice expensive factory rocker arms if they are offset heads. Why would you need to upgrade from them? Sell them and buy new heads and have some money leftover to grab a nice dinner.

                Jake
                 
                Last edited: Nov 3, 2018
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                • toolmanmike

                  toolmanmike FABO Staff Staff Member FABO Gold Member

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                  You talking TA heads?
                   
                • dad69dds

                  dad69dds Well-Known Member

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                  Someone did a valve job and shaved the heads and that caused a low compression on a few cylinders loosened up the rocker shaft compression came up so that's why I need roller rockers
                   
                • Demonic

                  Demonic Well-Known Member

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                  Shaving the heads wouldn't cause low compression in of itself, unless the pushrods are too long now. Sounds like they are. All things equal, resurfacing the heads will raise compression. Can you cc the heads? How much was machined off? Subtracting that amount from the pushrod length would be a start.
                   
                • j par

                  j par Well-hung Member

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                  Shim the shafts...
                   
                • MOPAROFFICIAL

                  MOPAROFFICIAL Well-Known Member

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                  Boy that last post is a hard read...

                  Milling would raise the compression.
                  Thicker head gasket would lower it back down, maybe to where it was before milling and possibly thinner old head gasket.

                  You need to know what head gasket was on it before and either use the same type or mill to compensate.

                  After that...measure for push rods if yours are too long
                   
                • dad69dds

                  dad69dds Well-Known Member

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                  No they are j heads not a ta both intake and exhaust are off set with a left and a right rocker non adjustable
                   
                • dad69dds

                  dad69dds Well-Known Member

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                  Oils thru the shaft push rods are solid
                   
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                  • dad69dds

                    dad69dds Well-Known Member

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                    I know that milling will raise the compression but if u don't mill the valves then u will not seat the valves because it is non adjustable rockers u cant adjust rockers get there oil from the block casting not through the push rods
                     
                  • toolmanmike

                    toolmanmike FABO Staff Staff Member FABO Gold Member

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                    Comp Cams rollers. Note the offset
                    : comp rollers.jpg
                     
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                    • toolmanmike

                      toolmanmike FABO Staff Staff Member FABO Gold Member

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                      • dad69dds

                        dad69dds Well-Known Member

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                        That's what im looking for tks toolmanmike
                         
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                        • MOPAROFFICIAL

                          MOPAROFFICIAL Well-Known Member

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                          You mean your pushrods are too long now.
                           
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