[Question] Ex, rockers.
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Ex, rockers.

  1. #1
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    Default Ex, rockers.

    Looking for advice, I have a new to me Gen V BBC tall deck, I pulled the girdle and rocker arms off to check everything out and noticed that exhaust rocker are hitting the poly locks at close to max lift, looks like the builder ground the slots the clearance them, any suggestions on what I need to do to correct this? Roller cam 825 lift, comp rocker arms.

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  3. #2
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    Quote Originally Posted by Bobbylisa View Post
    Looking for advice, I have a new to me Gen V BBC tall deck, I pulled the girdle and rocker arms off to check everything out and noticed that exhaust rocker are hitting the poly locks at close to max lift, looks like the builder ground the slots the clearance them, any suggestions on what I need to do to correct this? Roller cam 825 lift, comp rocker arms.
    I would first check rocker arm geometry and make sure the pushrods are the correct length.

  4. #3
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    I agree with the possible incorrect push rod length.
    When the rocker is in the extreme opposite position, is there still clearance for the Poly Lock? While there is a method to set up the geometry, it should normally have clearance at both extreme lift and at the other extreme too.

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  6. #4
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    Quote Originally Posted by obnoxious001 View Post
    I would first check rocker arm geometry and make sure the pushrods are the correct length.
    ^^^ This^^^

    Use the mid-lift method to determine correct pushrod length.




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    I'd agree with you, but then we would both be wrong

  7. #5
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    Quote Originally Posted by jimsplace View Post
    I agree with the possible incorrect push rod length.
    When the rocker is in the extreme opposite position, is there still clearance for the Poly Lock? While there is a method to set up the geometry, it should normally have clearance at both extreme lift and at the other extreme too.
    Yes there is clearance when the valve is closed.

  8. #6
    Senior Member capnfyr's Avatar
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    Default Tall deck.

    Go on you tube and look up the Straub engineering video on how to determine correct push rod length. This easy to follow and understand video is done by Scott Foxwell and goes through the process step by step. It's definitely helped me out when you get into or find these situations. Good Luck.
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  9. #7
    steelcomp was here
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    Hope this helps:

    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Quote Originally Posted by scott foxwell View Post
    Hope this helps:


  11. #9
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    Default Re-push rod.

    Looks to be a little off, studs are to short also rocker is on the threaded part of the stud.
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  12. #10
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    Quote Originally Posted by Bobbylisa View Post
    Looks to be a little off, studs are to short also rocker is on the threaded part of the stud.
    This is all very educated advice for proper valve train geometry. M

  13. #11
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    Where are you located? Someone nearby might be able to help get this sorted out.

    Paul

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    I think I have it figured out, went over it a couple of time and followed Scott’s video, a little surprised thing are this far off.
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  15. #13
    steelcomp was here
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    Quote Originally Posted by Bobbylisa View Post
    I think I have it figured out, went over it a couple of time and followed Scott’s video, a little surprised thing are this far off.
    I'm not. What you're liable to find now is that the rockers aren't right for the heads, and the sweep pattern will be way off to the exhaust side, especially on the intake valve.
    If God is your co-pilot, change seats!
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  16. #14
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    Quote Originally Posted by scott foxwell View Post
    I'm not. What you're liable to find now is that the rockers aren't right for the heads, and the sweep pattern will be way off to the exhaust side, especially on the intake valve.
    What would be a good rocker choice?

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