.620 mechanical Purple Shaft?

Mopar Performance Issues

  1. 67charger383

    67charger383 Well-Known Member

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    Will this cam work with my 383?
    12-1 compression, 915 heads, Weiand Tunnel Ram, 4.11 gears, E85 conversion
    Annotation 2020-08-13 125929.png
     
  2. MOPAROFFICIAL

    MOPAROFFICIAL FABO Gold Member FABO Gold Member

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    Sure. I'd install it 6* advance.
    Pay attention to the lash setting, cold .
     
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    • Garrett Ellison

      Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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      Is it the '67 Charger in your avatar and what's the tire size? Hot strip/street car or drag only?
       
    • 67charger383

      67charger383 Well-Known Member

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      Hot street and strip car, 295/50/r15s on 15x12 wheels with 3800lb SS springs and Gabriel HiJackers

      Nobody builds quick '67 chargers and they are one of my favorite mopars.
       
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      • 67charger383

        67charger383 Well-Known Member

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        Which would be a better cam, the .620 purple shaft or this GK mushroom cam im thinking about too? Screenshot_20200809-095117.png
         
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        • Garrett Ellison

          Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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          I've seen some magazine "street" cars from way back when run the mushroom cams. I like the numbers on the GK cam, very much like a slower lobe rate roller cam. But I'm going to sit back and see what the others say, but I think it would work pretty well advanced 6 degrees too.
           
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          • K.O. SWINGER

            K.O. SWINGER Well-Known Member

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            seems like a whole lot of stick for the street, I assume it's a manual transmission. I don't claim to be an expert on camshaft mating but that's more duration than I would be comfortable in anything but a full race application
             
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            • RustyRatRod

              RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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              I like the shroomer.
               
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              • 67charger383

                67charger383 Well-Known Member

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                Agree
                 
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                • yellow rose

                  yellow rose Master Of Insanity

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                  If you don’t run the mushroom cam I’d love to buy your lifters.

                  PM me if you are interested in selling them.
                   
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                  • 67charger383

                    67charger383 Well-Known Member

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                    Not mine yet. Ive been talking to the owner.
                     
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                    • rumblefish360

                      rumblefish360 So close, yet so far away FABO Gold Member

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                      The difference in cams as to which one is better is based on head flow for starters. Whats the ratio?
                       
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                      • K.O. SWINGER

                        K.O. SWINGER Well-Known Member

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                        Daddy likes a big old butt like 456 to go with a big lumpy stick! :rolleyes:
                         
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                        • DrCharles

                          DrCharles Well-Known Member

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                          I have a lightly reground Mini-Express mushroom setup in my 451 and have fun with it on the street (4-speed and 3.91 gears)
                          (Original cam specs: .654 gross lift, .024/.028 lash, 278@.050). After restoring the lobe taper: .652 gross lift, .018 lash, 272@.050. Idles at 1100 rpm or so, 8" vac. It really starts to come on above 3000 rpm and so far I haven't had the nerve to find the high end of the power band :D

                          But that GK mushroom (or even the .620 FT) is an awful lot of cam for a 383. You'll have to wind the piss out of it to take full advantage, and hopefully your 915 heads are ported some too.
                           
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                          • DrCharles

                            DrCharles Well-Known Member

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                            Daddy probably doesn't do much highway driving either! :poke:
                             
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                            • K.O. SWINGER

                              K.O. SWINGER Well-Known Member

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                              That was my point.
                               
                            • oldkimmer

                              oldkimmer FABO Gold Member FABO Gold Member

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                              Mushroom cams bridge the gap between a sft and a roller. Ur motor will need to be apart to install the lifters. It’s more a race only cam. Have the guides been shortened? Port work? Street or strip. How much lift can the pistons handle. Give us more info to go on. Is it stick or auto? U will need more gear and a stall approaching 4000. The .590 is a better cam. Kim
                               
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                              • '63GT

                                '63GT Well-Known Member

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                                I used to run an Ultradyne NF Solid that is very close to that stick in a 383 very much like yours. It liked 7500 rpm and a 5400 converter
                                 
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                                • oldkimmer

                                  oldkimmer FABO Gold Member FABO Gold Member

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                                  Exactually
                                   
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                                  • '63GT

                                    '63GT Well-Known Member

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                                    Sorry, Kim. was responding to the OP..
                                    I used to run that .590 too in my 383. good stick. (feels like a lifetime ago..)
                                     
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                                    • 512Stroker

                                      512Stroker We are all here because we are not all there.

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                                      That GK cam card is alot of cam.
                                      Hope you have a really good set of well ported heads with the proper springs and rocker arms.
                                       
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                                      • oldkimmer

                                        oldkimmer FABO Gold Member FABO Gold Member

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                                        Me too. I was agreeing that u need big gears and a very high stall converter. Kim
                                         
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                                        • '63GT

                                          '63GT Well-Known Member

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                                          YES! I had 5.13s and a low gear trans.
                                           
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                                          • 67charger383

                                            67charger383 Well-Known Member

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                                            I think I'm going to get the solid .620 purple shaft. I have 4.11 gears. I don't know what converter to get because I want it streetable
                                             
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                                            • fishmens67

                                              fishmens67 Well-Known Member

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                                              4500- 4800 stall would be good in the b-body.
                                              I think the 590 would be a better choice for the combo, heads being the limiting factor.
                                               
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