Small block cams

Fuel and Air Systems

  1. Ceedawg

    Ceedawg Well-Known Member

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    How much lift is lost on any LA engine because of the push rod angle off the lifter? I’m going to stick the cam in the lathe to check actual lift with a dial indicator but need to know how much is lost.
     
  2. Cuda416

    Cuda416 FABO Gold Member FABO Gold Member

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    Watching....

    I had just assumed you could measure the base circle and the lobe, then subtract. makes sense the angle would throw things off a bit.
     
  3. dadodgekid

    dadodgekid When in doubt... floor it

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    Alot! With a .557 sft in my last 340 with w-2 heads, i had actual .532 lift at the valve retainer. So the 59* lifter angle doesnt help
     
  4. brian6pac

    brian6pac Well-Known Member

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    I know it changes as lift gets higher but I read .005 - .015 lose.
     
  5. brian6pac

    brian6pac Well-Known Member

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    Are you figuring lash ?
     
  6. brian6pac

    brian6pac Well-Known Member

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    I know my .572 lift had about .545 at valve
     
  7. rumblefish360

    rumblefish360 So close, yet so far away FABO Gold Member

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    Wow! Some serious losses there!
    Adjust your rocker geometry! Get some back.
     
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    • brian6pac

      brian6pac Well-Known Member

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      That's all lash, mine was .028 lash, so really no lose.
       
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      • Ceedawg

        Ceedawg Well-Known Member

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        THE trick that Bob Glidden did to make that 79 Arrow fly in pro stock. Welded up the lifter holes then drill new ones to line up straight up to rocker, Chrysler made one of the new R blocks the same. Hemi has the same problem, only B-RB engines are correct. The block was designed for the poly head and Chrysler didn’t want to tool up another block to make the LA heads work right.
        Had to correct what I wrote.
         
        Last edited: Apr 16, 2021
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