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another baby hemi question

Discussion in 'The Hokey Ass Message Board' started by dirt, Feb 16, 2007.

  1. dirt
    Joined: Oct 26, 2005
    Posts: 907

    dirt
    Member
    from norco, CA

    i have what my dad told me was a 55 dodge red ram 270. i ran the numbers on the block and the block is a 56 plymouth poly 270. it does have hemi heads on it with the red ram covers. i have heard that some of poly motors were converted to hemi's. does any have any info on the convertion? is it just a head change or is there more to it? i dont have it here right now to run the head numbers(if there are any) to see what they are off of.
     
  2. pasadenahotrod
    Joined: Feb 13, 2007
    Posts: 11,776

    pasadenahotrod
    Member
    from Texas

    I believe I read the other day that is it just a head change. Good for you!
     
  3. George
    Joined: Jan 1, 2005
    Posts: 7,471

    George
    Member

    You have to change the total head assembly & the pistons. The valve reliefs are in a different location on a hemi, if valve lift is low enough you might get away with out changing them, maybe....
     
  4. dirt
    Joined: Oct 26, 2005
    Posts: 907

    dirt
    Member
    from norco, CA

    thanks for the info. a couple more questions. was this a common swap? is there any reason to use the poly block vs the hemi block?
     

  5. George
    Joined: Jan 1, 2005
    Posts: 7,471

    George
    Member

    Yes, it's common. People change them to Hemi because they can. Any Poly built on a Hemi block can be done, later ones like the 318 can't. There is no "advantage", in some cases there are push rod clearance problems. The Poly would have been a great & respected engine if the Hemi hadn't existed, but it does, so the Poly is the neglected step child.
     
  6. George
    Joined: Jan 1, 2005
    Posts: 7,471

    George
    Member

    It is common. There is no advantage, & sometimes there are push rod clearance problems.
     
  7. dirt
    Joined: Oct 26, 2005
    Posts: 907

    dirt
    Member
    from norco, CA

    thanks for clearing it up for me george.
     
  8. there is one advantage- the engine mounts-
    the 55 270 Dodges had the horseshoe mount on the front of the engine, all the '56 polys had side of block bolt bosses for side mounts.
    many feel that the side mounts are easier to adapt into other cars, and that they handle torque better.
     
  9. dirt
    Joined: Oct 26, 2005
    Posts: 907

    dirt
    Member
    from norco, CA

    that does make sense. thanks
     

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