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    Senior Member EVILFORCE's Avatar
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    I remember reading a post here that talked about Valve Train Geometry. It was talking about push rod length and how to determine the length you need. I did not find it in the search. Does anyone remember the link I am talking about? I have never had a problem picking them but thought I would read up on it and make sure I am a little more current. Thanks.
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    Quote Originally Posted by EVILFORCE View Post
    I remember reading a post here that talked about Valve Train Geometry. It was talking about push rod length and how to determine the length you need. I did not find it in the search. Does anyone remember the link I am talking about? I have never had a problem picking them but thought I would read up on it and make sure I am a little more current. Thanks.
    There are "length finders" tools available, but I seem to remember that the pushrod to rocker angle should be 90* at 1/2 valve lift..... I'm sure someone else will jump in and either confirm, or correct me.........Ray

    PS it may be different if it is a capsuled K boat........
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  4. #3
    gn7
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    "Little" plastic tools used for determining PR length are worthless. Any tool that does not take lift into consideration, is useless. There are only two ways to do this. Luntati's tool part # 80121(good luck finding one) or this way:

    Pushrod length and rocker arm geometry



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    Senior Member EVILFORCE's Avatar
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    Quote Originally Posted by gn7 View Post
    "Little" plastic tools used for determining PR length are worthless. Any tool that does not take lift into consideration, is useless. There are only two ways to do this. Luntati's tool part # 80121(good luck finding one) or this way:

    Pushrod length and rocker arm geometry
    Hey we agree. Those kits you get fromm Summit are JUNK. And I do believe that was the thread. Thank You.
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  7. #5
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    Quote Originally Posted by gn7 View Post
    "Little" plastic tools used for determining PR length are worthless. Any tool that does not take lift into consideration, is useless. There are only two ways to do this. Luntati's tool part # 80121(good luck finding one) or this way:

    Pushrod length and rocker arm geometry
    Lunati deal doesn't work either really. Don't waste your money.

  8. #6
    gn7
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    Can't find them anymore anyways. It did at least consider lift into the equation, and did work REASONABLY well with certain rocker. Crane, Isky, and early Crower SS are some it did not work with for sure.



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    Quote Originally Posted by EVILFORCE View Post
    I remember reading a post here that talked about Valve Train Geometry. It was talking about push rod length and how to determine the length you need. I did not find it in the search. Does anyone remember the link I am talking about? I have never had a problem picking them but thought I would read up on it and make sure I am a little more current. Thanks.
    Do your'e self a favor and get a soft 3/8 push-rod, cut it in half, thread the internals for a 1/4 threaded rod and figure out your'e desired length with soft springs. Stop thowing money at tools you can make your'e self. IMLAO M

  10. #8
    gn7
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    Ol Guy, we've been thru this before. It not about having an adjustable PR. Its about determining the correct length PR after you have an adjustable PR.



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    Quote Originally Posted by gn7 View Post
    Ol Guy, we've been thru this before. It not about having an adjustable PR. Its about determining the correct length PR after you have an adjustable PR.
    Well understand. Its all about useing an adjustable P/R to figure out the length you need. Ya know that length thing before you spend a butt load of money trying different lengths. Get the push-rod geometry right before you buy the proper p/r

  12. #10
    gn7
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    And most importantly, how to determine the correct pr length!!!!!!!!!



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  13. #11
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    Quote Originally Posted by gn7 View Post
    And most importantly, how to determine the correct pr length!!!!!!!!!
    My point exactlly!!!

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