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Technical Post 1960 389 in a 56 Pontiac?

Discussion in 'The Hokey Ass Message Board' started by Falcon H, Jul 13, 2017.

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  1. Falcon H
    Joined: Mar 11, 2015
    Posts: 142

    Falcon H
    Member
    from Waco Texas

    I've been trying to figure out what I want to do for an engine in my Pontiac. I've been mulling over a 389, but the only ones in my area are post 1960 for some reason. If I used a water pump from my old engine (the mounts are built into the water pump\timing cover), motor mounts shouldn't be an issue. the deciding factor is weather the hydromatic will bolt up. Does anybody know?
     
  2. lostone
    Joined: Oct 13, 2013
    Posts: 1,795

    lostone
    Member
    from kansas

    If memory serves correctly, 64 down should work perfectly. Trans should bolt up to.
    65 is when all the changes came about as far as trans bolt pattern.

    If yours has the original v8 in it I believe you can even use the front timing cover, water pump etc off the old engine. But you have to use it as a complete assembly. That way you don't run into bolt pattern differences on the water pump etc.
     
  3. Falcon H
    Joined: Mar 11, 2015
    Posts: 142

    Falcon H
    Member
    from Waco Texas

    Thank you for the info. My google-fu failed me :D
     
  4. Falcon H
    Joined: Mar 11, 2015
    Posts: 142

    Falcon H
    Member
    from Waco Texas


  5. oldolds
    Joined: Oct 18, 2010
    Posts: 3,189

    oldolds
    Member

    There have been discussions on here about this swap before. I seem to remember something about coolant passages being different, but that may be intake manifold related.
     
  6. dogwalkin
    Joined: Jan 17, 2013
    Posts: 91

    dogwalkin
    Member
    from tn

    55-60 will bolt together for the most part. 61-64 will interchange. 65-79. That's the general rule. There are other small differences but that should get you close


    Now if you buy one of the trans adapters that opens up a lot of options. But... It cost a lot of money too.

    Sent from my VS990 using The H.A.M.B. mobile app
     
  7. dogwalkin
    Joined: Jan 17, 2013
    Posts: 91

    dogwalkin
    Member
    from tn

  8. dogwalkin
    Joined: Jan 17, 2013
    Posts: 91

    dogwalkin
    Member
    from tn

    That link above will explain better what I was trying to say.

    Sent from my VS990 using The H.A.M.B. mobile app
     
  9. Todd553
    Joined: Feb 16, 2005
    Posts: 524

    Todd553
    Member

    The hydro will only bolt to a 59-60 389 unless you can find an old B&M type adpter. I have a 57 Chieftain and I am replacing the 347 with a 59, 389 stroker motor. It will be 453 inches and be backed with an old B&M hydro. IMG_2139.JPG SC Hydramatic (1).JPG
     
    Texas Webb and Bowtie Coupe like this.
  10. Good looking Poncho,like the 2dr post.
     

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