Pushrod for hydraulic cam and 273 rocker arms

Small Block Mopar Engine

  1. daves66valiant

    daves66valiant 68 Dart 340/727:66 Signet Vert 340/5spd: 68 D100

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    No fuckin dice at Summit. The advertised length is not even close. Will be ordering custom ones from OE
     
  2. Wyrmrider

    Wyrmrider FABO Gold Member FABO Gold Member

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    If those are your heads in the pics the adjuster is down way too far
    you want less than 0 threads showing with those long neck adjusters
    re-masure with your adjustable pushrod with the adjuster up to near the max
    3 thread adjuster were much shorter from the ball to the threads
    and as a very wise poster said- send your adjusted adjustable pushrod to the mfg or at lest a diagram showing how you mesured
    pushrod cups are different depths so overall length can be different

    from a thread on Moparts so a little more than 1/4"
    "9/32 From the bottom of the (iron) rocker to the end of the ball. And that's as long as the oil feed hole to the adjuster is drilled right under the part where the adjuster goes through."
    "I had one set of Crane W-2 rockers that had the oil hole about .090 lower than directly under where the adjuster comes through so you has to run the adjuster a bit lower or you'd smoke the adjuster."
    and if you do not have oil holes under the arms- both sides- drill them
    I prefer Magnum/AMC lifters and oil through the pushrod oiling for the adjuster ball
    they smoke way too easily
     
    Last edited: Aug 25, 2018
  3. STRorange

    STRorange Well-Known Member

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    Good thread guys! (bad pun lol)
    The less thread sticking out, THE BETTER!
    The further you go out/down, the more RATIO you are losing...
    Sometimes you burn up adjusters and can't see the problem?
    Oil in the cup and they still wear out?
    Change them for another set and the problem goes away...
    Maybe its metal to metal contact of similar steels???:drama:
    Hard cups, soft adjusters or the other way around...:lol:WHO knows...:realcrazy:
     
  4. dogbreath

    dogbreath Well-Known Member

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    I just set up a 340 w/273 rockers yesterday. 68-340 block decked about .006 , .053 felpros , j-heads , lunati hydraulic lifters. Perfect overall pushrod measured 7.125. Nothing off the shelf available. Used the aformentioned 7.190 proform pushrods. will work with about a 1/2 turn showing .
     
  5. bbab3

    bbab3 Well-Known Member

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    I just went through the same issue with my 273 build. You need 1 1/2 to 2 threads exposed after 1 turn preload. I ordered mine from OE Pushrods. Excellent price and quality. Buy the way have overall and working length available when ordering. Working length= overall- cup depth.
     
  6. ir3333

    ir3333 Well-Known Member

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    what does being able to see threads have to do with correct geometry?The longer your adjuster the more leverage on the weak neck between the threads and the ball. If your geometry is right
    and no threads are showing and there is no metal interfering with correct operation you should be golden...or am i missing something
     
  7. dogbreath

    dogbreath Well-Known Member

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    sounds right to me.
     
  8. toolmanmike

    toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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    I think it's all about having clearance between the cup and the rocker arm. 2-3 threads seems to be golden .
     
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