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BBC retro-fit pushrod ?

  1. #15
    steelcomp was here
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    Quote Originally Posted by gn7 View Post
    there is only ONE CORRECT PUSHROD LENGTH for any given set up, and it's actually pretty simple to explain, not as easy to achieve. When your cam is at half the net lift(lash set) a line thru the pivot fulcrum to the nose roller is 90* to the valve stem. Once you have done this a few times it gets pretty easy, but most just throw up their hands and whip out some plastic thingy or some wack method and call it good. As BD stated as the valve gets longer the valve tip moves closer to the rocker stud, and this some that you just have to except, trying to get it back to the center may end up with really bad geometery
    Just couldn't help yourself, could ya.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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  3. #16
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    Quote Originally Posted by BDMarine View Post
    If you have to run a long valve to get the proper installed height for some spring applications, with proper geometry the rocker is going to run a little towards the outside edge of the valve. Yours looks a little extreme, but not knowing your setup it could simply be too long of a pushrod. The longer the valve, the closer the tip gets to the rocker stud. If you shorten up the pushrod to make the rocker in the center of the valve tip you can end up with horrible geometry, and if you get the geometry perfect you CAN end up with what you have and wear the guides. I try to find a happy medium.
    Good explaination. Pushrod length shouldn't be used to determin the loction of the roller on the valve tip. If the geometry is correct, the roller will be where it will be.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  4. #17
    gn7
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    Quote Originally Posted by steelcomp View Post
    Just couldn't help yourself, could ya.
    Sorry, it's what I do




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