Rocker arm clearance.
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Rocker arm clearance.

  1. #1
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    Default Rocker arm clearance.

    How much clearance do I need between rocker arm and valve spring retainer?.

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  3. #2
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    Default Valve closed. right??

    Quote Originally Posted by Bobbylisa View Post
    How much clearance do I need between rocker arm and valve spring retainer?.
    I assume you're referring to a closed valve position when the retainer is near the rocker radius. Yes, when we start playing with aftermarket parts we do run into issues like this. I believe I was told .050 minimum, but we also have to live with the fact that the valve is moving all over the place during operation, but should come back as the valve closes fully... I cured my issue, (Crower Enduro rockers on AFR heads), with longer pushrods that raised the rocker up, and also aligned the roller on the rocker to a better position on top of the valve stem as the valve event went from start to finish... Are you dealing with ALL aftermarket parts??? Or trying to blend some of the stock stuff along with some aftermarket parts??.... I also discovered that not all roller rockers use the same profile in the radius area and some offer considerably more clearance than others... I think it was Bob that posted some pictures showing the different brands and their respective profiles...
    Ray
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  4. #3
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    Yes closed position, and all after market parts, can you grind a little on the rocker arm to add clearance, or is that making a weak point?

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  6. #4
    gn7
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    Quote Originally Posted by Bobbylisa View Post
    Yes closed position, and all after market parts, can you grind a little on the rocker arm to add clearance, or is that making a weak point?
    Who's rockers are you using? Most BBC aftermarket rockers will clear 1.625 springs



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  7. #5
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    (Comp cam) rockers 1320, retainer 731, keepers, are 631, spring od is 1.554,

  8. #6
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    Quote Originally Posted by Bobbylisa View Post
    (Comp cam) rockers 1320, retainer 731, keepers, are 631, spring od is 1.554,
    Something is very wrong. That rocker will clear a 1.55 spring easily. Your Push rods must be way short.



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  9. #7
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    X2. If you even have to ask about retainer/rocker clearance I'd say your pushrods are too short. How did you determine pushrod length?
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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