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Rocker Arms

This is a discussion on Rocker Arms within the Internal Engine forums, part of the LSx Technical Help Section category; 1.5 Ratio, 3/8'' Stud Rocker Arm Or 1.6 Ratio, 3/8'' Stud Rocker Arm Which is better, what is the difference? ...

  1. #1
    Impounded LS1 Trans am's Avatar
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    Rocker Arms

    1.5 Ratio, 3/8'' Stud Rocker Arm Or 1.6 Ratio, 3/8'' Stud Rocker Arm

    Which is better, what is the difference?
    Thanks for the help.

  2. #2
    Veteran Hi-Po's Avatar
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    Increasing the rockerarm ratio is a horsepower trick that has been widely used. High ratio rocker open the vavles quicker lift them higher and close them later all with out affecting seat timing. trade offs are....the faster accerations and decelerations produced by higher rocker arm ratios reduce valve train stability ..... inviting early valve float.

  3. #3
    Impounded LS1 Trans am's Avatar
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    Arnt the stock LS1 Rocker arms like 1.7? So going to 1.6 or 1.5 would actually not be good?

  4. #4
    Veteran Hi-Po's Avatar
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    small block chevys come with1.6 ratio rockers in place of the standard 1.5. No i would not go smaller if thats what your asking. going smaller would actually decrease your theoretical ratio.

  5. #5
    Slow'er'Ass Mr. Luos's Avatar
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    Yes...stock LS1 rocker arms are 1.7.
    2008 Trailblazer SS
    Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
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    531.1 RWHP 481.3 FT/Pounds all motor.

  6. #6
    Alcohol Injected PaganEgyptian's Avatar
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    Ummm, I thought they were 1.6's... I know 3.8L engines are 1.7's.

    Hi Mr Luos -Tim

  7. #7
    Slow'er'Ass Mr. Luos's Avatar
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    What up Tim??

  8. #8
    Alcohol Injected PaganEgyptian's Avatar
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    Just looking around here, so far I really like this site. Since most of the Hideout and most of you and Josh's buds hangout here, I figured I would become sociable too
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  9. #9
    No 55mph 1QuikWS6's Avatar
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    Stock LS1 rocker ratio is 1.7 usual upgrade is to install 1.8's

  10. #10
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    I went to the 1.8 Yella Terra shaft mounted roller rockers,comp 918 springs, chromemoly push rods on a stock cam. Revs to 6500 rpm with a nice hp & tq increse.

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