Ultradyne cams

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  1. Bluefish

    Bluefish FBBO Gold Member FBBO Gold Member

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    Anyone ever use one of Harold Brookshire's SFT cams? I'm looking at a 294/298 276/271 on a 108 with .650/.620 lift for my 511. Currently going 10.06@134 and looking for more. This cam has the NF63 NF64 lobes. Thanks
     
  2. PRHeads

    PRHeads Well-Known Member

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    Might want to double check those specs.

    NF63 - 294@.020, 267@.050, .4058 lobe lift
    NF64 - 298@.020, 271@.050, .4134 lobe lift
     
  3. Bluefish

    Bluefish FBBO Gold Member FBBO Gold Member

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    What do you see that looks out of place? These are the specs that Tim@Bullet gave me.
     
  4. Budnicks

    Budnicks You Can Just Thank Me Later FBBO Gold Member

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    a .4058 with a 1.5:1 ratio rocker = .6087 gross valve lift. not including lash
    you had 0.650 lift mentioned
    good luck
     
  5. Bluefish

    Bluefish FBBO Gold Member FBBO Gold Member

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    I’m using a 1.6/1.5 combo.
     
  6. bearman

    bearman FBBO Gold Member FBBO Gold Member

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    Bluefish tell us more about the rocker combo and why please curious minds need to know. Thank you
     
  7. Bluefish

    Bluefish FBBO Gold Member FBBO Gold Member

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    I use a 1.6 rocker on intake and 1.5 on the exhaust. The exhaust gas is under high pressure when it opens and empties the cylinder without issue. The intake valve needs all the help it can get getting the cylinder filled. That's why you always see the exhaust valve smaller than the intake valve. A 1.6 rocker on exhaust side has been found to improve nothing.
     
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    • bearman

      bearman FBBO Gold Member FBBO Gold Member

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      Thanks for the follow up. Makes good sense to me now that I think about it.
       
    • Budnicks

      Budnicks You Can Just Thank Me Later FBBO Gold Member

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      0.4058 x 1.6 =0.64928" gross valve lift not including lash

      makes a difference for damn sure 10%
       
    • Bluefish

      Bluefish FBBO Gold Member FBBO Gold Member

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      I figured actual lift with lash would be about .633" on the intake.
       
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      • Bluefish

        Bluefish FBBO Gold Member FBBO Gold Member

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      • furious70

        furious70 Well-Known Member

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        I used a 590/613? of his 20 yrs ago with crane ductile rockers.
        Only cam that big I've ever used and the only one that beat up adjusters and broke stuff. Maybe my fault, maybe the ramps on his lobes.
         
      • rumblefish360

        rumblefish360 Well-Known Member

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        The exhaust mention is often true and if found otherwise, IE; more lower is made, there is probably something that could be improved. A minor pick up is one thing, pick up a bunch.... that’s another.

        I have a W5 small block I’m building with a NF split cam.
        *I Think* I have the same lobes as well. I’d have to dig it up. It’s a slow process.
        Staying tuned to this....
         
      • Bluefish

        Bluefish FBBO Gold Member FBBO Gold Member

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        Harolds cams are aggressive. This one has 5* more duration at .200 than my current comp cam(270/276@50 .640 110)
         
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