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Duration or Lift......and any experience with the crane "fast bleed" lifter

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by twenty_below0, Feb 24, 2002.

  1. twenty_below0

    twenty_below0 1/2 ton status

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    Duration or Lift......and any experience with the crane \"fast bleed\" lifter

    Ordering my cam for the new beast tomorrow and I once heard a saying on here that duration equals torque and lift equals h.p. ...........or vise versa so which is it and also how about some opinions on the fast bleed lifters by Crane? I've used the RHOADS lifters before and they worked good but I really didn't like the noise they make at an idle so I'm wondering how much quieter these new fast bleeds are?? As usual allinfo appreciated
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Re: Duration or Lift......and any experience with the crane \"fast bleed\" lifter

    What year blazer are you going to install the cam into? Duration does make torque and lift will help HP. If this is going into a later computer controlled blazer you need to watch out for how much duration and lobe separation you choose. If the specs are too much the computer will get all confused and you won't be happy with the results. As far as your lifters are concerned, I would stick with factory lifters and no anti pump up style, they are very noisy.

    1989 blazer, 383 stroker, D44 / 14FF, 4.56, locked, 35 BFG mud
    Scott
     
  3. BorregoK5

    BorregoK5 1/2 ton status

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    Re: Duration or Lift......and any experience with the crane \"fast bleed\" lifter

    I used the Crane fast bleed lifters in my last 68 Camaro build on a 327ci. They were not "noisy" but just stlightly louder than stock. They definately smoothed out the idle and lent to a better vacuum.

    I started with nothing and I still have most of that left! - <a target="_blank" href=http://community.webshots.com/user/borregok5> Pictures</a>
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Re: Duration or Lift......and any experience with the crane \"fast bleed\" lifter

    Generally:

    More Duration = High RPM HP
    More lift with less duration = Low RPM Torque

    Other factors play into it too though. Don't just pick a cam based on those two factors. If you have fuel injection and a MAP sensor, your cam better have a wide LSA.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  5. twenty_below0

    twenty_below0 1/2 ton status

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    Re: Duration or Lift......and any experience with the crane

    The reason I ask is that comp makes a cam that's 218 degrees of duration at .050" (intake and exhaust) and 488 lift which in comparison with the extreme 4x4 cams is better......what do you think, and also has any body considered having a custom ground cam??
     

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