64 401 to Dynaflow

Discussion in ''Da Nailhead' started by supersteve, Oct 2, 2016.

  1. supersteve

    supersteve Member

    Hi guys,
    I hate to keep pestering with questions but here goes.

    What is the difference between a 62 401 and a 64 401 as far as parts compatibility goes? Mainly I am concerned with hooking up a 64 401 to a Dynaflow from a 63. As I understand it there is a difference in the pilot hole and crank flange. Any other real differences? Is there an easy rule of thumb for identifying this stuff by eye?

    I have a 62 401 that needs a block but I may have a shot at scoring a whole 64 motor. Should I just use the whole 64 motor and hook it up to a Turbo four-hunnert? Can i use the 64 block with my 62 innards?

    Many thanks :bglasses:
     
  2. Babeola

    Babeola Well-Known Member

    Differences are:
    • 57-63 - 2 7/8" crank hub for flexplate, larger pilot hole in crank for transmission converter, triangular flexplate (dynaflow), starter ring gear on transmission converter, longer starter to reach ring gear.
    • 64-66 - 2 1/2 in crank hub for flexplate, smaller pilot hole in crank for transmission converter, round flexplate (ST300 and ST400), starter ring gear on flexplate, shorter starter to reach ring gear.
    You would basically need a 63 or earlier crank, triangular flexplate and long starter to use your 64 Nailhead with a dynaflow. Conversely, it only requires a bushing/hub kit, round flexplate and short starter go from a 63 or earlier Nailhead to a ST300 or ST400 with a Nailhead bolt pattern.

    You want to be sure to swap rotating assembly parts from the same displacement engine as they are weighted differently. Engine balance can be disturbed if not, and unwanted vibrations can result.

    Cheryl :)
     
  3. Smokey15

    Smokey15 So old that I use AARP bolts.

    Has anyone ever 'enlarged' the pilot hole on a '64-'66 crankshaft and made it work?
     
  4. Babeola

    Babeola Well-Known Member

    Once the crank machining was done, you would need a 3/16" spacer on the hub to locate the larger center of the triangle flexplate. That would all be expensive without free access to a machine shop.

    Cheryl :)


    Sent from my iPhone using Tapatalk
     
  5. Smokey15

    Smokey15 So old that I use AARP bolts.

    Doesn't the converter have the larger 2 7/8 hub. Spacer shouldn't be as expensive as swapping crakshafts, etc. Just thought that may be an option.

    BTW, Cheryl, I think I told you that I was going to use the same screen name as you. Two things stopped me. First, you already had it. Second, sooner or later, someone on here was going to find a picture of me. :laugh:
     
    Last edited: Oct 2, 2016
  6. nekkidhillbilly

    nekkidhillbilly jeffreyrigged youtube channel owner

    and here I would be better off with a 64 motor and I have a good 62 engine. ky to Washington Is to far to trade.
     
  7. supersteve

    supersteve Member

    Thank you for your detailed analysis, Cheryl. Very big help.

    Yeah, I'm getting in contact with a lot of people that are just too far away for cost effective dealing especially with really big, heavy iron stuff.
     
  8. John Codman

    John Codman Platinum Level Contributor

    I think Doc has done it. Send him a PM. It could be that what he did was the other way, but check with him. Anything is possible if you are determined enough.
     

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