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LS1 and 1.85 rocker arms?

This is a discussion on LS1 and 1.85 rocker arms? within the Internal Engine forums, part of the LSx Technical Help Section category; I have a question. I am considering going to 1.85 ratio rocker arms. Currently, I have Comp Cams valve springs, ...

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    LS1 and 1.85 rocker arms?

    I have a question. I am considering going to 1.85 ratio rocker arms.

    Currently, I have Comp Cams valve springs, do these need to change? They have a spring rate of 441 lbs/in.

    My cam dimensions are as follows.


    Intake Exhaust

    Intake Gross valve Lift .525 .532
    Lobe lift .3090 .3130

    Will these springs work and will the valve cover require modifications?

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    What rockers are they?

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    I wouldn't go with 1.85 rockers. If anything, I'd get Crane quick-lift rockers. The geometry is different.

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    Quote Originally Posted by 9t8z28 View Post
    What rockers are they?
    Okay, I am sort of changing my mind.

    I am thinking about going with the Crane Cams, Gold Race Extruded Aluminum Roller Rocker Arms for LS1/LS6 in 1.7 Ratio.

    My concern is why do I have to concern myself with lifter bleed down. Just trying to understand why the bleeding is necessary. I read SLPs instructions yes I know they suck but they do not concern themselves with bleeding.

    Just trying to understand why I do with the crane Rocker arms?

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    what else are you doing with the rocker arm change?

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    Quote Originally Posted by Bouvers View Post
    what else are you doing with the rocker arm change?
    While here pushrods also.

    Any other ideas?

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    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by GMCAMARO View Post
    While here pushrods also.

    Any other ideas?
    use an ls6 spring
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

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    Quote Originally Posted by nhraformula View Post
    use an ls6 spring
    Already have Comp Cams -18

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by GMCAMARO View Post
    Okay, I am sort of changing my mind.

    I am thinking about going with the Crane Cams, Gold Race Extruded Aluminum Roller Rocker Arms for LS1/LS6 in 1.7 Ratio.

    My concern is why do I have to concern myself with lifter bleed down. Just trying to understand why the bleeding is necessary. I read SLPs instructions yes I know they suck but they do not concern themselves with bleeding.

    Just trying to understand why I do with the crane Rocker arms?
    The SLP rockers are actually pretty good. The Crane rockers are a little expensive but definitly good quaility. I would recommend the Harland Sharp rockers or the Yella Terra which are around $350-$400

    What do the instructions state to do?

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    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    The SLP rockers are actually pretty good. The Crane rockers are a little expensive but definitly good quaility. I would recommend the Harland Sharp rockers or the Yella Terra which are around $350-$400

    What do the instructions state to do?
    The SLP rockers arent bad, i gained 9 rwhp and 17 lbs of tq when i had them put on. The problem with 1.85 rockers is that they limit your cam selection.
    if you google nhraformula 1.85 rocker arms, you find my graph from the dyno.

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    Quote Originally Posted by 9t8z28 View Post
    The SLP rockers are actually pretty good. The Crane rockers are a little expensive but definitly good quaility. I would recommend the Harland Sharp rockers or the Yella Terra which are around $350-$400

    What do the instructions state to do?
    Which instructions?

    The SLP one's just say unbolt them, put them in, torque them and way you go. The Cranes say bleed hydraulics.

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    Quote Originally Posted by GMCAMARO View Post
    Which instructions?

    The SLP one's just say unbolt them, put them in, torque them and way you go. The Cranes say bleed hydraulics.
    SLP rockers are just like stock style. non adjustable. the crane are fully adjustable. so you need to set correct lifter preload. ran them on both of my cars. got a solid 17 rwhp gain using the 1.8 rockers.

    here is how you adjust them
    http://vincihighperformance.com/LS1%...TRUCTIONS.HTML

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