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Thread: Push rod length

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

    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
    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.

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