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1.8 RATIO, SLP roller rockers

This is a discussion on 1.8 RATIO, SLP roller rockers within the Internal Engine forums, part of the LSx Technical Help Section category; I was wondering if I put SLP's 1.8 ratio rockers on my 98 Z28, with a proper tune, would I ...

  1. #1
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    1.8 RATIO, SLP roller rockers

    I was wondering if I put SLP's 1.8 ratio rockers on my 98 Z28, with a proper tune, would I have any problem passing PA emissions tests?

  2. #2
    Veteran Hi-Po's Avatar
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    1999 TA WS.6

    I dont beleive so. But why put them on at all? Put your money into something else IMO.

  3. #3
    Senior Member Redphoenix1998's Avatar
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    stock rockers are fine and for the price, invest in something else

  4. #4
    Member Transam388's Avatar
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    98 Trans AM

    As the others have said, stick with the stock rockers. I had gotten the 1.8 Crane roller rockers but then if you go to a more aggressive cam you have to start worrying about clearnance issues both with valve / pistons and valve covers. I went back to 1.7 and don't think 1.8's are worth it IMO.
    98 T/A: HPE 5.3 Heads, 238/242 113 cam, Kooks 1 7/8 stepped LT headers, Custom Y pipe, Cut out, Borla, NW 90MM TB, FAST 90MM Intake, TB Bypass, Under Drive Power steering and Crank, 150 Dry NOS, Yella Terra rockers, 3400 TC, HPE tuning,

  5. #5
    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    no tune is needed if you go larger ratio rockers. while it can be a high doller per hp gain, for those that want more without changing a cam, it's a good direction to go.

    as far as cam selection goes, so long as your springs can handle it and you have proper piston to valve clearances, there won't be a problem.

  6. #6
    member since may 2000 nhraformula's Avatar
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    2000 nhra edition formula

    i had the slp 1.85s and sold them.
    save the money for a cam kit or headers.
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

  7. #7
    We'll be back... GatorSS's Avatar
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    If you can pass the emissions test now, you'll still pass it with the new rockers.

  8. #8
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    2002 Vette

    Larger ratio rockers will increase the overlap triangle, is it a sniff test?

  9. #9
    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by vettenuts View Post
    Larger ratio rockers will increase the overlap triangle, is it a sniff test?
    still pass

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