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smog legal cam

This is a discussion on smog legal cam within the Internal Engine forums, part of the LSx Technical Help Section category; i have a 98 z28 a4 with 104k miles and was thinking of doing a head and cam swap. the ...

  1. #1
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    1998 Camaro Z28

    smog legal cam

    i have a 98 z28 a4 with 104k miles and was thinking of doing a head and cam swap. the only thing is i want to keep it emission legal. i live in cali so this is the strictest test as it is, my car just recenly passed the sniffer test, but i will be moving to arlington texas in about 3-6 months i dont know how strict it is over there. but ive been looking at many cams but none advertise smog legal not even the ls6. so my question is whats the biggest is can go while keeping is smog legal, i love hp and would go for the bigger bang for the buck like texas speeds magic stick #4. but i will also be driving it daily and ocassional strip and maybe some road course action

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    Slow'er'Ass Mr. Luos's Avatar
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    224/224 is about it.

    And you need a great tuner.

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    thanks, what about lift? will .550 do for int and exh. and does lobe seperation play any part in idle quality and drivability. will it have that nice lopey idle?

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    Slower Than a 3rd Gen juiced99ws6's Avatar
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    Mystic Teal
    99 Trans Am & 01 CBR 929

    if you want a lopey idle then go with about a 112 lsa bute driveability and idle quality wont be as good. You should go with about a 114 for good driveability and a little ore low end power. You would be good with a 224/224 .550 .560 cam on a 114

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    candy red
    98 Camaro Z28

    I thought 112 LSA power came in sooner than the 114 LSA and had a bit more torque.

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    Member jmhvenom's Avatar
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    Get a z06 cam / head combo. With tune should be pretty legal and will make some power.

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    Senior Member Street Lethal's Avatar
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    2009 Corvette ZO6

    Quote Originally Posted by DANs1998Z
    thanks, what about lift? will .550 do for int and exh. and does lobe seperation play any part in idle quality and drivability. will it have that nice lopey idle?
    Lift won't hurt you in regards to the sniffer, too much overlap will. I'd recommend speaking with the folks over @ Thunder Racing, as they can grind you a cam with .600"+ lift, 22x duration, be emissions friendly, while making more power to the wheels than you could possibly imagine (thank you, LSK lobes)....

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    Mine passed easily in Calif with a .221 with .566 Lift @ 114 LSA---In hindsight i could have gone slightly more on the duration like mayge .222 or .224--However I don't think any 112 LSA will pass--The more overlap the harder to pass---evry cam is a little different--most 112 LSA cams are pretty aggressive and have lots of overlap to push the HP up higher in the RPM band

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    thanks. do you have a custom ground cam or is it from a certain supplier?

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    Quote Originally Posted by DANs1998Z View Post
    thanks. do you have a custom ground cam or is it from a certain supplier?
    The cam is from TPIS---However they custom ground it for beacause i changed the LSA from 112 to 114 and changed the lifts a tiny bit too

  11. #11
    member since may 2000 nhraformula's Avatar
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    a comp cams 224/224 with a tune will pass.
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

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    Member M6HUGGERSS's Avatar
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    millenium yellow
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    Get a z06 cam / head combo. With tune should be pretty legal and will make some power.
    i would call that a waste of time.
    and i have a Z06.

    Im in CA. and i passed smog twice. in my 99SS making 400rwhp.
    10.6:1CR ported LS1 heads, 222/224 .566/.568 114 cam and bolt ons.

    if i had to do it again.
    id go....

    11.2:1CR ported LS6 heads or (AFR,TR,DART etc.)
    and a 224 580ish 114.,
    and with the right bolt-ons you should see..... 425rwhp 400rwtq.

    good luck.
    315rwhp 98 SILVER Z28 (3500lbs)- SOLD
    400rwhp 99 HUGGER SS (3375lbs)- SOLD
    340rwhp 02 YELLOW Z06 (3040lbs)

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    [QUOTE=M6HUGGERSS;679643]i would call that a waste of time.
    /QUOTE]


    Would deff go with something better than a stock Z06 cam--After going thru all the truoble of a cam change--believe me you''ll be disappointed if you didn't go at least to a 221/221 @114---the stk Z06 cam i thnk has a 117 LSA which is the big factor in keeping it from making more HP--even though the Duration may be 212/218

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