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What do cam numbers mean?

This is a discussion on What do cam numbers mean? within the Performance forums, part of the General Discussion category; Looks like some matrix mumble jumble to me. Can anyone explain what all the numbers, periods, and slashes mean?...

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    What do cam numbers mean?


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    Looks like some matrix mumble jumble to me. Can anyone explain what all the numbers, periods, and slashes mean?
    '99 RCSB 4x4, 4.8l, 5sp, 285 BFG AT's

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    maladjusted bthomas454's Avatar
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    Re: What do cam numbers mean?

    what do you want to know? lift? lsa? duration? a little of everything?
    Quote Originally Posted by demon
    i'm sure there's forums full of like-minded people that would enjoy reading your nonsense. please feel free to spew your stupidity there from now on
    2005 gmc "work truck" (no really its my company truck)

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    loves Mickie James oldred95's Avatar
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    Re: What do cam numbers mean?

    I'm in the same boat. A little of everything would be nice.
    1995 Silverado - ported vortec heads, 4L80E, efans, LT4 Hot Cam, Rear disc brake conversion w/drilled and slotted rotors
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    Re: What do cam numbers mean?

    Yeah I just don't know anything about it. Maybe if somebody is willing give the numbers on a stock chevy cam and then a performance one and compare and explain them.
    '99 RCSB 4x4, 4.8l, 5sp, 285 BFG AT's

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    maladjusted bthomas454's Avatar
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    Re: What do cam numbers mean?

    Quote Originally Posted by demon
    i'm sure there's forums full of like-minded people that would enjoy reading your nonsense. please feel free to spew your stupidity there from now on
    2005 gmc "work truck" (no really its my company truck)

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    Re: What do cam numbers mean?

    Quote Originally Posted by bthomas454
    Thanks that was pretty informative. Some of the earlier stuff kind of lost me though. I still don't really understand the numbers though. Take this for instance: 222/226 .569/.573 112

    I'm guessing the 222/226 is the overlap? What's the rest?
    '99 RCSB 4x4, 4.8l, 5sp, 285 BFG AT's

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    Registered User mds2004's Avatar
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    Re: What do cam numbers mean?

    Quote Originally Posted by RyPkr_99
    Thanks that was pretty informative. Some of the earlier stuff kind of lost me though. I still don't really understand the numbers though. Take this for instance: 222/226 .569/.573 112

    I'm guessing the 222/226 is the overlap? What's the rest?
    Correct, that is the duration at .050
    The .569/.573 is the lift and the 112 is the lobe seperation. If I am incorrect someone please correct me.

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    Vortec HSR forsaken_one's Avatar
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    Re: What do cam numbers mean?

    222/226 .569/.573 112

    222 Is the duration that the intake valve is open
    226 Is the duration that the exhaust valve is open
    .569 Is the intake valve lift
    .573 Is the exhaust valve lift
    112 Is the lobe separation angle between the exhaust and intake lobes
    The lift numbers are commonly used with 1.5:1 rocker arm in mind.

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