Here is the Custom Cam/Hydraulic Flat Tappet

Engine, Trans & Driveline

  1. FlagCraig

    FlagCraig Well-Known Member

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    What do you all think?
    It's is going in 67 GTX and it will be a street car (shows and cruising). We are getting closer. All parts are in and ready to proceed.
    Might do a pass or two at a track but no plans to race.
    I am not against changing cam if needed. It was recommended by the Mopar/Engine shop.

    236/236 Duration
    .364/.364 Lift
    108 Degree Lobe Separation
    +3 Advance on Cam

    Going in:
    505 Stroker (67 440)
    Ported and Machined 915 Heads (Original)
    Automatic 727 (rebuilt)
    Rear End Gears 3:55
    Headers TTI
    Torque Converter Stall 3200-3500
    Carb 770 Holley Avenger
    Holley Street Dominator Intake

    Thanks for thoughts.
     
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    • oldbee

      oldbee FBBO Gold Member FBBO Gold Member

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      Duration at .050" lift? Might be really nice!
       
    • texas69bee

      texas69bee Well-Known Member

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      Is the lift really .364?
       
    • vintage chromoly

      vintage chromoly Well-Known Member

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      Lobe lift.
       
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      • moper

        moper Well-Known Member

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        That's the lobe lift. Multiply by rocker ratio for lift at the retainer.
        What is the static ratio? Which pistons are being used?
         
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        • fratzog lover

          fratzog lover Well-Known Member

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          .546 lift. Any idea what the heads flow?
           
        • mentor70

          mentor70 Well-Known Member

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          kinda small for a 500 CI (duration) lift is OK, but i and i wouldnt even consider running iron heads on a 500 either.
           
        • wyrmrider

          wyrmrider Well-Known Member

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          Need Head FLows (ported, large ex valve? larger intake etc), stroke and rod length, compression ratio
          without the duration no one can tell if it would work or not
          .050 is for degreeing in the cam, not to spec one
          what rockers and did you do B3?
          solid, hyd, roller?
          OK OK I see the thread title
          still need to know the seat duration- most likely at .006 but call it out
           
          Last edited: Sep 4, 2018
        • FlagCraig

          FlagCraig Well-Known Member

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          Okay additional info:

          -.50" for Intake and Exhaust Duration.
          -Eagle Forged Crank 4.250 stroke 8 bolt.
          -Forged Piston and Ring Set 4.350x4.25"
          -Rod Bearing Narrowed H Series 2.200"
          -Eagle H Rods 7.100" x .990" x 2.200"
          -Compression high 9's.
          -Heads were given a "racing" valve job. Installed 8 no lead seats
          and 16 bronze valve guides.
          Valve Guide .343 x .502 x 2.125
          Intake Valve 11/32" Stem, 2.14" Head
          1.81" Exh Valve
           
        • IQ52

          IQ52 Well-Known Member

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          Yes, yes. Time and again it has been documented that those old iron heads just cannot be made to work on big cubic inch engines.

          Wait.........WHAT?

          If you scroll down to the third engine in this article, you can see the results of 906 iron heads on a pump gas 500" engine run on Comp Cams' dyno.

          https://www.hotrod.com/articles/mopp-1203-the-amsoil-mopar-muscle-engine-challenge/

          O.P. You already own the cam and it's in the engine? Run it. If you don't like it, then change it.


           
          Last edited: Sep 4, 2018
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          • PRHeads

            PRHeads Well-Known Member

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            Not what I woulda used...... but not way different either.

            It should run fine.
             
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            • moper

              moper Well-Known Member

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              IMO, the cam's a little small. It sure doesn't need any advance built into it. I see that a lot on these long stroke engines and it's a total waste IMO. These engines are not soft down low. They don't need it.
               
            • Heimedw

              Heimedw Well-Known Member

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              The best thing you can spend money on in any engine build is the heads! They are the biggest factor on how the engine will perform. Game changer for me watching engine masters on motor trend. They did a test on a 408ci ford small block with this little bitty cam to test if heads could be to big and the results still blows me away! AFR make amazing heads by the way wish they would make some mopar stuff!
               
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              • FlagCraig

                FlagCraig Well-Known Member

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                Keeping the 915 heads on the car was important to me. They were special heads only used on the 440 in 1967 (as we all know). I'm not looking to race this car just a good strong rebuild. Anyone can say they have aluminum heads (many suppliers) but the 915's are rare.....and original to the car. And if done right and matched with some of todays advances on other parts/accessories can give good power. If it puts me back in the seat now and then and lets me do a few burnouts I'll be satisfied.
                 
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                • IQ52

                  IQ52 Well-Known Member

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                  Run the cam and heads you have. If this Mopar/Engine shop has the foggiest notion what they are doing, you'll be fine.
                   
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                  • wyrmrider

                    wyrmrider Well-Known Member

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                    I run 915 heads on my motorhome ported but with stock motor home valves and on my sedan with much larger intakes cut down to 30 degrees and the 1.81 exhausts both are 9:1 motors with under .035 quench (D Dished 6 pack pistons)
                    no use you running a bigger cam on 015
                    it's the combination
                    as Iq52 says try it since you already own it
                    single pattern cam is fine with headers especially with the larger valves- hope they are not large tube headers though
                    if you then want to post back your compression readings
                    still looking for the seat duration- got a cam number
                     
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