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Correct throw out bearing/pilot bearing?

Discussion in 'U-shift em' started by tubecatgs, Sep 3, 2017.

  1. tubecatgs

    tubecatgs Finally a 4 speed......

    I ended up buying a zoom clutch (kit 30043) for my 72 350. Was looking at some higher end clutch kits but motor rebuild ended up being $5,000 and running out money for this project :) ....

    https://www.summitracing.com/parts/zzz-30043

    It came with a throw out bearing and pilot bearing. Summit says it works for a Buick 350.

    1) I noticed the original throw out bearing has a triangle hump in it (see pic). What is the purpose of that and does it matter the new one doesn't have it?

    2) I don't have the motor back yet but have see threads where people say the Buick 350 pilot bearing is an odd size. How do I know if I need to replace mine and any idea if the pilot bearing in the Zoom kit will fit?

    Thanks all!
     

    Attached Files:

    tubecatgs, Sep 3, 2017
    #1
  2. CJay

    CJay Supercar owner Staff Member

    The little hump in the groove is to prevent the release (throwout) bearing from spinning in the fork. Some bearings will have a pin instead for the same purpose . But they should all have something to prevent it from spinning

    As far as the pilot, you'll have to measure the hole in the back of the crank. A GM pilot bushing will measure around 1.097. If the engine wasn't intended to be a 4 speed, you'll find that the finish machining wasn't done at the factory and the hole will be smaller. On my 455, the hole was 1.085. More than likely you'll have to machine the pilot to the crank. Also make sure the hole doesn't have a "step" in the back of the hole. If so, you'll have to reduce the depth of the pilot bushing. Ask me how I know all this! Good pilot bushing will NOT be magnetic. If yours is chuck it and find a different one

    Is the block drilled for the z bar ball stud? Some automatic equipped blocks aren't drilled. Especially later 72 blocks
     
    CJay, Sep 3, 2017
    #2
  3. CJay

    CJay Supercar owner Staff Member

    And dont put any grease on the pilot bushing!
     
    CJay, Sep 3, 2017
    #3
  4. tubecatgs

    tubecatgs Finally a 4 speed......

    Ok thanks. I will measure it. The car was an original manual transmission car with a 3 on the tree so I assume the crank was factory drilled and have been running the 4 speed already for a few years no so yes the engine has a z bar stud already..... Thanks Jason!
     
    tubecatgs, Sep 4, 2017
    #4
  5. flynbuick

    flynbuick Guest

    The last Zoom brand clutch I used required too much pedal pressure. Something like a Dual Friction is a better choice.
     
    Last edited by a moderator: Sep 7, 2017
    flynbuick, Sep 4, 2017
    #5
  6. CJay

    CJay Supercar owner Staff Member

    Ah, I didn't realize it was a manual already. Definitely change out the pilot since you have everything apart.

    As far as clutches go, I used a stock replacement set up in my 70 GS I just converted to a stick. I got it from Falcon. Mark is a great guy and really knows his stuff. The kit was $185 and came with everything, Its butter smooth

    http://www.falconauto.com/

    A quick google search on that Zoom set up revealed its intended for circle track racing and its listed as having a kevlar disc. As Jim mentioned, Im not sure what kind of pedal you'll get with that or what the clutch engagement will be like. Plus Kevlar is a little tricky to break in. On the plus side, it holds up better to abuse
     
    CJay, Sep 4, 2017
    #6
  7. tubecatgs

    tubecatgs Finally a 4 speed......

    Thanks Jason. Falcon auto had the correct release bearing with the hump.
     
    tubecatgs, Sep 7, 2017
    #7

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