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1.7/1.8 rockers hp value

This is a discussion on 1.7/1.8 rockers hp value within the Internal Engine forums, part of the LSx Technical Help Section category; what hp increase could be expected from installing 1.7 or 1.8 rockers on a stock 99 ls1...

  1. #1
    Junior Member mxlplx71's Avatar
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    pewter
    1999 trans am

    1.7/1.8 rockers hp value

    what hp increase could be expected from installing 1.7 or 1.8 rockers on a stock 99 ls1

  2. #2
    TerribleTed TerribleTed's Avatar
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    not much,,,and not worth doing ,,,change that cam,,,,valve springs too if cam change for assurance,,

  3. #3
    Junior Member mxlplx71's Avatar
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    i was looking for bolt on i really dont want to change the cam yet, maybe this winter, just easy cheap boltons or free mods first.

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    O U 8 1 2 Spaz's Avatar
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    not worth the money... plus it will limit your options for cams unless you go custom ground...

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by Spaz View Post
    not worth the money... plus it will limit your options for cams unless you go custom ground...
    x2

    if you are wanting to do cheaper first mods ...stay out of the engine (no internals) look into getting her breathing right and shitting right (exhaust) on top of that even tho not as fun or "cool" do suspension
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    Firebird Encyclopedia 9T8W66's Avatar
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    FYI LS1's already have 1.7 Rockers.
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  7. #7
    Junior Member mxlplx71's Avatar
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    Quote Originally Posted by 9T8W66 View Post
    FYI LS1's already have 1.7 Rockers.
    thanks i did not know that,,, this is the first gm product ive ever owned i just left the mopar camp sold a 68 440 dart and shelby z daytona to buy this
    99 ta
    Im learning alot every day reading this forum.

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    Quote Originally Posted by Spaz View Post
    not worth the money... plus it will limit your options for cams unless you go custom ground...
    How does 1.8 limit cam choice? It just takes a smaller cam to achieve big numbers.

    Op, If you want 1.8 rockers. Buy them. You WILL see an increase through the entire rpm band with high ratio rockers. Not so much in horsepower but torque.
    They are worth the money to me.
    Last edited by Klug23; 05-22-2010 at 06:25 PM.

  9. #9
    I don't sell out! blackSS01's Avatar
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    Quote Originally Posted by Klug23 View Post
    How does 1.8 limit cam choice? It just takes a smaller cam to achieve big numbers.

    Op, If you want 1.8 rockers. Buy them. You WILL see an increase through the entire rpm band with high ratio rockers. Not so much in horsepower but torque.
    They are worth the money to me.
    The little increase you see would be better off with a cam It limits your choice of cam due to the ratio and how much it opens the valves. Duration of a cam dictates valve reliefs (in the pistons) more then lift does but lift does come into play. Rockers are not cheap at all And going from 1.7 to 1.8 is not an increase thats worth 10 cents on these motors. OP, like everyone else said, keep stock rockers and spend your money on other parts of the car.
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  10. #10
    Firebird Encyclopedia 9T8W66's Avatar
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    Don't forget that changing rockers also means changing valvesprings aswell.

  11. #11
    Junior Member mxlplx71's Avatar
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    is there a list somewhere of the "free mods"?

  12. #12
    I don't sell out! blackSS01's Avatar
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    Quote Originally Posted by mxlplx71 View Post
    is there a list somewhere of the "free mods"?
    installuniversity if you google it, you will find it.

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