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Thread: Best cam ?

  1. #1
    Join Date
    Jun 2007
    Posts
    172

    Default Best cam ?

    What is the best cam choice for an b hobby class?
    med. banked 3/8 mile track
    Motor specs on what I have.

    Stock bottom end
    Hyper pistons .030 over
    stock heads 441 or 882
    edelbrock performer intake 7101
    Holley 600 single line vac. sec.
    1.5 stamped rockers
    1.94 & 1.50 valves
    Cam rule is .425 lift at the valve..

    What would work the best with what I have?
    Any advice would be helpful.. Thanks

  2. #2
    Join Date
    May 2008
    Posts
    574

    Default

    Several grinders make cams for the lift rule you have.
    The stock bottem end is your limiting factor here.
    For a cheap, off-the-shelf grind, the Howards 110071 or the 112701-06 would get a little more topend.
    Good luck.

  3. #3
    Join Date
    Jun 2010
    Location
    Santa Land
    Posts
    554

    Default

    Hyd. or solid lifter?
    My sarcasm is a pre-emptive strike to your stupidity!!

  4. #4
    Join Date
    Jun 2007
    Posts
    172

    Default

    Sorry...Hyd... Would a special grind be a better choice over off the shelf ? With the valve lift rule.

  5. #5
    Join Date
    Jun 2007
    Posts
    172

    Default

    I looked at the Howards cams at summit. My next question is which is better more duration or valve lift? Thanks..

  6. #6
    Join Date
    May 2008
    Posts
    574

    Default

    Theoretically, you cannot get enough valve lift in a SBC head because flow increases with lift which is influenced by the ability of the camshaft lobe/lifters/springs etc., to open/close as quickly/much as possible/optimal timing on openings and closings/ still be dependable and the valve springs able to control the "bounce", vacuum demands /carb booster signal etc. etc. etc. Hence solid roller cams were born.
    The bigger duration holds the valve is open longer. Higher duration/more overlap( both intake and exhaust valves open at the same time.)
    More duration usually means that the engine will make power higher in the RPM range.
    Camshafts are the trickiest thing in an engine to try to understand IMO.
    Sorry I cant explain it better.

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