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Thread pitch for holes in 61 283 balancer?

Discussion in 'The Hokey Ass Message Board' started by rainh8r, Oct 15, 2009.

  1. rainh8r
    Joined: Dec 30, 2005
    Posts: 792

    rainh8r
    Member

    I need to pull the balancer/hub off a stock 61 283 crank that has a couple of threaded holes in it. Since the holes are rusty, I want run a tap down them but I can't see what thread they are (NC or NF), and neither thread bolt (3/8) will start because of the rust. Anyone know what thread the holes are? I'd like to use the right tap the first time. Thanks, Rob
     
  2. they are 3/8-24 NF
     
  3. rainh8r
    Joined: Dec 30, 2005
    Posts: 792

    rainh8r
    Member

    Thanks, I'll tap it out tonight.
     
  4. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,682

    Bruce Lancaster
    Member Emeritus

    Be cautious and run in a rifle cleaning brush so you can see the threads...I do know that the 350's are sometimes found with 3/6 coarse threads there, so I would carefully check early engines as well just in case.
     

  5. squirrel
    Joined: Sep 23, 2004
    Posts: 50,228

    squirrel
    Member

    I haven't seen coarse threads in a small block damper, but there are millions I haven't worked on. big blocks have coarse threads
     

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