if big is good bigger is

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  1. moparsquid

    moparsquid FBBO Gold Member FBBO Gold Member

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    building a engine that will run e85 found a roller cam and lifters at a good price ,question is its in the 750 lift range ,ive never had a roller and the lift is way higher than ive been using is this a to big or just right cam
     
  2. zyzzyx

    zyzzyx FBBO Gold Member FBBO Gold Member

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    Well, It all depends on all of the variables. The first one is: will your heads, valve spring pockets, and pistons
    be O.K. with that big of a cam. The second is: Automatic or 4 Speed? 3: Power Brakes or manual? 4: How are
    you getting the E-85 into the engine? Sometimes a deal isn't a deal! I would call the cam manufacturer and ask
    if this cam is a good choice for your setup.
     
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    • 66Satellite47

      66Satellite47 FBBO Gold Member FBBO Gold Member

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      Back in the day, I switched from a 635/645 - 276/280@.050 mushroom solid(similar to Mini Express) to a Comp 720-274@.050 roller in a 451/400 12.0 CR with valve pockets & OK piston to valve clearance ported 906's, tunnel ram w/ 2-650 DP's. The roller was over a tenth & 1 1/2 MPH slower. Comp re-ground the roller to 660/280 which was equal to the mushroom in performance.
      Get advice from the manufacturer (it helps to talk to real tech guy, not just the phone salesman).
       
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      • Cojohnso1

        Cojohnso1 Well-Known Member

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        I agree. In fact, ill go as far as the cam should be one of your last decisions in a build. Typically bottom end is given with what you have. Or willing to spend/work with. Head selection is typically based on bottom end specs. (Obviously you can't go with tight closed chamber heads if you have big dome pistons above deck line) Head configuration with fuel/air manifold selection will dictate best cam performance options. Building a motor around a cam selection? Very much limits options.
         
      • Mopars & Missiles

        Mopars & Missiles Well-Known Member

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        ........Gooder??????????
         
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        • 451Mopar

          451Mopar Well-Known Member

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          Depends on your build. Really need the duration specs. Is this cam around 280 duration @ 0.050"?
          I think you might run into piston-to-valve clearance issues if using shelf type ICON pistons. I think the Mahle Flat tops might have deeper valve reliefs, but I can't confirm it? They list more cc's for the valve pockets than the ICON pistons. They also use 1.5mm/1.5mm/3.0mm ring pack. I would use those Mahle pistons if building a higher compression engine.
           
        • 1 Wild R/T

          1 Wild R/T FBBO Gold Member FBBO Gold Member

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          I highlighted the key statement..... If the deal is good enough having a billet cam reground to the specs of your choice can be a viable option...
           
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          • 451Mopar

            451Mopar Well-Known Member

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            If the heads don't support the airflow at the higher lifts, the ports might flow less (at the higher lifts), and your spending more power just to work the valve spring to a higher open pressure.
             
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            • moparsquid

              moparsquid FBBO Gold Member FBBO Gold Member

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              I was looking at a set of max wedge but decided to much cost most likely 440 source stealth the pistons are aftermarket with valve notches I'd like to run e85 with injection or a tunnel ram and two 4,s in a 64 330 straight axel car 727
               
            • kiwigtx

              kiwigtx Trendsetter Staff Member FBBO Gold Member

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              ...gonna be a tight fit??? :)
               
            • 66Satellite47

              66Satellite47 FBBO Gold Member FBBO Gold Member

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              Even with aftermarket pistons & reliefs you need to check piston to valve at all the various installed centerlines you may use. Big long duration cams require substantial valve reliefs. I would sacrifice a tenth in CR to avoid piston to valve conflict my motors.
              Wild RT is right, a billet roller can be reground to specs that match your combination, probably at a fairly reasonable price.
              Roller lifters have gotten awfully expensive.
               
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              • moparsquid

                moparsquid FBBO Gold Member FBBO Gold Member

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                cutting down the cam to a livable lift is a good idea I would have never thought of it first time thinking of using a roller the price is very good for the cam and lifters that's why I was thinking of it thanks
                 
              • 66Satellite47

                66Satellite47 FBBO Gold Member FBBO Gold Member

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                Key is to get the experienced Mopar cam tech to pick a good lobe design for your combo.
                 
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