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Thread: cam timing

  1. #1

    cam timing

    over the winter i replaced my cam.. the car is i900lbs . power glide w/brake. 350 sbc 30 over . last year the cam was comp cams 292 , 501 lift hyd. cam 202 valves, vortec heads. 750 holley. car ran 6.50 -60s 1/8 mile. with 60-fts at 1.44. then i had a cower cam #00357 587 lift mech. installed with a adjustable cam gear, and have it set @ 0. with 35 degees timing. car runs the same as last year. my question is what wound help in timing advancing the gear 2 or 4 or more degees

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
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    La.
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    I would suggest advancing the cam 4* and timing 40* BUT i think the cam is still too small for that weight car, it would run better with a 6.30/6.40 lift cam.

    JMO

    Zip.

  3. #3

    cam timing

    now if i advance it, will i have any issues with valve to piston clearance. or will that stay the same. thanks for your help.

  4. #4
    Senior Member EXPERT BUILDER
    Join Date
    Dec 2010
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    345
    I agree with Zip on the bigger cam, something in the low six hunderds or advance the cam in the engine. This will give a little more bottom end power and when you advance it you will bring the intake valve closer to the piston. Would really need to know what size pistons and where the valves open and close. I would advance the cam and check the PVC this should help.

  5. #5
    Senior Member RACING JUNKIE
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    Dec 2008
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    Sugar Hill, GA
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    1,365

    Re: cam timing

    Quote Originally Posted by john910
    now if i advance it, will i have any issues with valve to piston clearance. or will that stay the same. thanks for your help.
    For stock motors, .045 is the minimum valve to piston clearance
    On High RPM motors, use .080 on the intake and .100 in the exhaust.

    1. Write down the lash you will use (example Int = .028, Exh = .030.
    2. With the cam on the heel, adjust the lash to zero, do not lock the polynut.
    3. Put a dial indicator on the rocker, just above the spring retainer.
    4. Intake number = .080 minus lash (example .080-.028 = .052).
    5. Tighten the poly nut .052.
    6. By hand, rotate the crankshaft while watching the rocker go up and over the nose of the lobe "feeling" for interference.
    7. If none, tighten another .020 and rotate again. Repeat and you will eventually find your clearance.
    8. Repeat for the exhause (example .100 - .030 = .070).

    If you change the advance on the cam, you must start over.
    JMP but works from me.
    Dave
    http://www.racingjunk.com/profile/343797
    "All that is necessary for the triump of evil is for good men to do nothing" Edmund Burke

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