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Technical Push Rod Length

Discussion in 'Traditional Hot Rods' started by dart4forte, Aug 9, 2021.

  1. dart4forte
    Joined: Jun 10, 2009
    Posts: 101

    dart4forte
    ALLIANCE MEMBER
    from Mesa, AZ

    By chance is there any early Hemi owners that happen to know the Desoto 330 Hemi pushrod length?
     
  2. ras
    Joined: Apr 28, 2013
    Posts: 70

    ras
    Member

    Pushrod_01.jpg Pushrod_00.jpg From a 1956 330ci, hope this helps.
    Rick
     
  3. dart4forte
    Joined: Jun 10, 2009
    Posts: 101

    dart4forte
    ALLIANCE MEMBER
    from Mesa, AZ

    Looks 10 3/4”
     
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  4. Beanscoot
    Joined: May 14, 2008
    Posts: 2,110

    Beanscoot
    Member

    Aren't the intake and exhaust pushrods different lengths?
     
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  5. dart4forte
    Joined: Jun 10, 2009
    Posts: 101

    dart4forte
    ALLIANCE MEMBER
    from Mesa, AZ

    I thought they were all the same with non adjustable rockers
     
  6. Intake and exhaust will be two different lengths,,,,,be cautious of that .

    Tommy
     
  7. dart4forte
    Joined: Jun 10, 2009
    Posts: 101

    dart4forte
    ALLIANCE MEMBER
    from Mesa, AZ

    So not same length. Inherent with all early hemis?
     
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  8. Deuces
    Joined: Nov 3, 2009
    Posts: 21,252

    Deuces
    Member
    from Michigan

    A good pair of 12" calipers should get you very close.... I have the Mititoyo calipers... Very accurate!...
     
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  9. The ones for my 426 are two lengths as well,,,,,,it all goes back to the rocker layout .
    The intake rockers rotate inboard,,,to push the valve down .
    The exhaust rotate outboard to push the valve .
    Since the exhaust rocker is almost twice as long ,,,,it requires a different angle of attack from the pushrod,,,,,so length is quite a bit different .

    Tommy
     
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  10. dart4forte
    Joined: Jun 10, 2009
    Posts: 101

    dart4forte
    ALLIANCE MEMBER
    from Mesa, AZ

    Good to know
     
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  11. indyjps
    Joined: Feb 21, 2007
    Posts: 4,379

    indyjps
    Member

    Pushrod length checker is $20-$30. Blocks get decked, Heads get milled. Buying pushrods twice sucks.
     
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  12. sdluck
    Joined: Sep 19, 2006
    Posts: 2,795

    sdluck
    Member

    Cams are Reground,no one can give you the correct answer,measure for your self.
     
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  13. dart4forte
    Joined: Jun 10, 2009
    Posts: 101

    dart4forte
    ALLIANCE MEMBER
    from Mesa, AZ

    Fortunately I have the build sheet for this motor
     
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  14. Bert Kollar
    Joined: Jan 10, 2007
    Posts: 1,061

    Bert Kollar
    Member

    Exhaust are longer, high decks longer than low decks
     
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  15. ras
    Joined: Apr 28, 2013
    Posts: 70

    ras
    Member

    I apologize for the quick and misleading response last night. That’s what I get for trying to do one more thing before I go in for the night, I should know better. Every response after mine is accurate. The exhaust and intake pushrods are different lengths. And much more accurate measurements are needed to complete the build of a high end motor.

    Maybe I misread or misinterpreted your question but I took as a generic question. As in; I have these pushrods laying here but I don’t know if they are Desoto, Dodge, or are poly motor pushrods, about what length am I looking for. Or I’m headed to a swap meet but… Never would I assume someone would build the engine using the same tools as to frame their house.

    The pushrod pictured is an exhaust. Taken from a 1956, S-23, 330ci motor, if you had seen the rest of the motor you would be as confident as I that it had the original pushrods. It may have even had the original oil. If you want a rough measurement for the intake I can get you that this evening. If you are looking for a good set of stock pushrods, I suggest watching the Hot Heads Swap Meet site. As mentioned by many of the previous post, most people that put thousand’s into their build go with adjustable pushrods. That leaves a lot of stock sets being sold for around $20-$30 a set.

    Rick
     
    Deuces likes this.
  16. DDDenny
    Joined: Feb 6, 2015
    Posts: 15,321

    DDDenny
    Member
    from oregon

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