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Thread: Push rod length

  1. #1
    Senior Member EXPERT BUILDER
    Join Date
    Dec 2002
    Location
    spring creek nv.
    Posts
    328

    Push rod length

    Building a 496 bbc;deck has only been cleaned and flaten out;;head gasket is .080[needed to drop comp due to decide to street use eng and wanted to be able to use pump gas]have afr oval v2 alum heads;;comp hyd roller cam xm284hr-12[547 lift]howaeds hyd roller lifters #91161;;;and comp cams #1620-16 roller rockers;;;put stock push rod in and checked patteren on valve stem and riding on edge of valve stem[toward outside of head]put my adjustable push rod in and rechecked;;same location;;no matter how short or long i make the adjustable push rod i still showing rocker roller setting on edge of valve steam;;;what am i missing or doing wrong;;first time checking push rod lengths;[i'm using marker on stem so can see line where rocker is riding and rotating eng where valve opens and closes at least 2 times];since heads says will need .200 to .250 longer push rod i figure i should check it;;;lot of money in eng and don,t want to destroy it by having wrong push rods;;

  2. #2
    Senior Member RACING JUNKIE curtisreed's Avatar
    Join Date
    Feb 2004
    Location
    KIEFER, OK.
    Posts
    1,309
    If you can't get it to move no matter where you put the length of the pushrod checker, I would look toward the rocker having the wrong pivot to roller tip length.

    You might watch this video about checking midlift geometry.

    https://www.youtube.com/watch?v=o5is9BsH5OU


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