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Cam Size?

This is a discussion on Cam Size? within the Internal Engine forums, part of the LSx Technical Help Section category; How big of a cam are you guys running and still passing emmissions? I want to go big with a ...

  1. #1
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    Mystic Teal/Chameleon grn
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    Cam Size?

    How big of a cam are you guys running and still passing emmissions? I want to go big with a nasty idle but it must pass emmissions. It will be run with pacesetter headers and high flow y pipe w/cat.

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    2 SS's are better than 1 Jays00ss's Avatar
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    About the biggest you can go is a texas speed 224R. Lucky me I don't have to worry about emissions.
    2000 SS Camaro Heads, Large cam, Fast 90, 9"w/430's and locker, yada yada yada... you get the picture

    1971 SS ElCamino 402 Big Block 550HP

    2006 Silverado 2500HD 496 cubic inches of pure muscle

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    Slow'er'Ass Mr. Luos's Avatar
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    Depends on the restrictions.

    Still trying to decide if I want to see if I can get my 248/254 629/622 113 by. (In a stroker)

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    Mystic Teal/Chameleon grn
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    does the stroker make a differene? I wanted something in the 230's (intake and exhaust duration) on a 112 LSA for a lopey idle. Is that out of the question?

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    Slow'er'Ass Mr. Luos's Avatar
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    Going to be running cats I assume?
    Might be able to tune that around emissions. The 112 will make it tough.


    And yes, the stroker makes a difference. The cubes 'eat up' the cam size.

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    Mystic Teal/Chameleon grn
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    yes i will be running cats.
    A 114 LSA isn't going to be a very choppy idle will it...

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    Slow'er'Ass Mr. Luos's Avatar
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    You would be surprised.
    But it won't be as much as the 112.

    230 cams on a 114 are great street/driveable cams.

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    Mystic Teal/Chameleon grn
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    I really wanted the TSP 231/237 112LSA. That would probably give me enough power with a good power band and the idle that I'm looking for....but will it pass emmissions haha

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    member since may 2000 nhraformula's Avatar
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    sniffer or odb?
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

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    Mystic Teal/Chameleon grn
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    ???

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    TunedbyFrost.com Tuner Frost's Avatar
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    If I lived somewhere like that, I'd run a stock cam for a day or two and just swap it back out for the rest of the year. If you are already setup for the big cam, the swap back and forth wouldn't take too long.

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    Mystic Teal/Chameleon grn
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    can i get it tuned to pass emmissions? And then have it tuned back to where i want it for the rest of the year? It is in my daily driver but I dont drive a lot...maybe only a few miles a day if that, so I'm not concerned about drivability really.

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    member since may 2000 nhraformula's Avatar
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    emissions testing, is it a sniffer test or odb?

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by nhraformula View Post
    emissions testing, is it a sniffer test or odb?
    Assuming his are the same as mine....so sniffer and visual.


    Like Frost said...stock cam isn't that hard to swap in and out to get it to pass. Actaully be considering that myself. I already have everything to do it.

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    Mystic Teal/Chameleon grn
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    ya its a sniffer and visual....I'm assuming (they look under the car).
    I'm not going to be doing my swap so I didnt want to pay someone to swap it out once a year.

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    not to thread jack but whats the difference between sniffer and odb? sorry fairly new and going through a bit of a cam crisis myself! thanks

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    Slow'er'Ass Mr. Luos's Avatar
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    Sniffer they test the exhaust emitted from the car.

    ODB they basicly check the computer and pass you.

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    Mystic Teal/Chameleon grn
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    When they passed my car last time they checked the emmissions, looked under the car, and i think checked the computer.

    So is a 231/237 112LSA too much to ask for? If it is, what other cam would give me good power with a lopey idle and pass?

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    Mystic Teal/Chameleon grn
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    just found this.
    Do you think that would pass?

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by greenTA View Post
    When they passed my car last time they checked the emmissions, looked under the car, and i think checked the computer.

    So is a 231/237 112LSA too much to ask for? If it is, what other cam would give me good power with a lopey idle and pass?
    I think the 231/237 would be a little too much.


    I will be talking with my tuner this afternoon though...might have a slightly better idea then.

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