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plymouth 259 pistons in a 241 Dodge hemi

Discussion in 'The Hokey Ass Message Board' started by vetteson, Aug 28, 2013.

  1. vetteson
    Joined: Oct 7, 2010
    Posts: 39

    vetteson
    Member

    Will 259 Plymouth pistons clear the valves in an over-bored 241 Dodge hemi (using stock cam)? I see that the pistons in the 241 are notched.
     
  2. snaptwo
    Joined: Apr 25, 2011
    Posts: 692

    snaptwo
    Member

    I would think that the Mopower engineers put those eyebrows in for a reason don'cha think.
     
  3. TR Waters
    Joined: Nov 18, 2006
    Posts: 1,343

    TR Waters
    Member
    from Vermont
    1. Early Hemi Tech

    The notches in a hemi piston are directly across from one another. The notches on a poly piston are offset from one another. With a bone stock cam, you should be able to get away with it. Other than that, I would consider massaging the notches to replicate the hemi piston. Keep in mind that in stock form, these are very low compression engines.
     
  4. wbrw32
    Joined: Oct 27, 2007
    Posts: 4,619

    wbrw32
    Member

    Pistons MUST match bore and stroke ..IF those are the same then the pistons will work..albiet the tops will look different..
     
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  5. 73RR
    Joined: Jan 29, 2007
    Posts: 5,122

    73RR
    Member

    That is a pretty big cut...suggest that you sonic check the cyl walls as a first step.
    As Tom suggests, if you use them, lengthen the eyebrow a bit. It sounds like a stock-sorta rebuild so balance should not be an issue.

    In the FWIW department, for a couple hundred more dollars you could have some decent compression...;)


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