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Cam Specs?

This is a discussion on Cam Specs? within the Internal Engine forums, part of the LSx Technical Help Section category; What does the HR 14+4 mean on the specs for this cam? LS1 3714/3715 HR14+4 Adv.Duration 275/277 Duration 222/224 Lift ...

  1. #1
    99WS6TA
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    Cam Specs?

    What does the HR 14+4 mean on the specs for this cam?
    LS1 3714/3715 HR14+4 Adv.Duration 275/277 Duration 222/224 Lift 566/567 114 LSA

  2. #2
    Slow'er'Ass Mr. Luos's Avatar
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    +4 is 4 degrees of advanced timing ground into the cam.
    2008 Trailblazer SS
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    1999 Pontiac Trans Am WS.6 #1747 SOLD
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  3. #3
    99WS6TA
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    What does the advanced timing do?

  4. #4
    Slow'er'Ass Mr. Luos's Avatar
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    Gives you a very good reason to run premium fuel.


    It advances the timing 4 degrees. Most of the time...I would assume it makes it easier to install the cam. Cams tend to have an install degree point...but most install straight up dot-to-dot. So in this case...when installing dot-to-dot it would have the proper install degree already there.

    For some reason I can't really come up with a good explanation for what advanding the timing does right now. Must be too early.

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    Senior Member mrr23's Avatar
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    HR means Hydraulic Roller. a 114 +4 means 114 (intake centerline) ICL ground +4 advanced. the max lift point on the intake lobe is at 114* moved to 110*. normally, the LSA and ICL match. but not always. by advancing the cam, it opens/closes the valves sooner. by doing this, it has more low end power. by retarding the cam, it takes away low end and makes more top end power. generally, we are talking about a 400 rpms difference given the exact same cam specs.

    now why don't they just grind it to 110 LSA? rough idle, hard tuning, very narrow power band to name a few.
    Last edited by mrr23; 01-16-2006 at 05:34 PM.

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    Senior Member mrr23's Avatar
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