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What is the true lift with 1.6 rockers.

This is a discussion on What is the true lift with 1.6 rockers. within the Internal Engine forums, part of the LSx Technical Help Section category; I have a 350 engine in my 77 camaro that has a 280 comp cam that has a 480/480 lift ...

  1. #1
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    What is the true lift with 1.6 rockers.

    I have a 350 engine in my 77 camaro that has a 280 comp cam that has a 480/480 lift before the 1.6 rockers were added.What is the life now with the rockers.I figure it is about 510/510 what is it?

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    Veteran Hi-Po's Avatar
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    Well,

    Cam*rocker arm ratio gives you .768"

    You sure the cam lift is .480?? Do you have the cam card? I think you fused some numbers up here.

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    Quote Originally Posted by Hi-Po View Post
    Well,

    Cam*rocker arm ratio gives you .768"

    You sure the cam lift is .480?? Do you have the cam card? I think you fused some numbers up here.
    The cam is a 280/280 comp cam with gross valve lift of 486/486 and I have the cam card in front of me.This is the gross lift without the 1.6 rockers.the Duration at .050 is 230/230.
    Last edited by Street Fighter; 03-25-2009 at 04:00 PM.

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    Moderator Firebirdjones's Avatar
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    Gross lift is figured on the cam card with the stock 1.5 ratio in mind.

    So if you have .486 you divide that by 1.5 and you have your lobe lift.

    Then take the lobe lift and multiply by the new 1.6 ratio and thats the new lift you will have.

    .518 is the lift with a 1.6 rocker. The lobe lift (which is also on the cam card) should be .324
    Hope that helps.

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    Wink

    Thanks for the reply, I know now how to get the true lift once 1.6 rockers are added. once again thanks.

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    Moderator Firebirdjones's Avatar
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    Anytime.

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