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Correct convertor - stall speed for 1970 Z28?

Discussion in '1970 - 1973 Specific' started by weim55, Feb 27, 2017.

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  1. Feb 27, 2017 #1
    weim55

    weim55 Member

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    Working on a '70 Z28 with a completely stock LT1 down to the exhaust manifolds and solid cam. At some point in the past the original turbo 400 was rebuilt and a rebuilder special 12" convertor was installed. Stall speed is a lousy 1200rpm. Any of you have actual experience with this or know the stock convertor stall speed or spec.? Source for replacement? Thinking of hitting the aftermarket for a quality 11" specd to 2200 - 2300 stall. Thoughts?

    thanks,

    Steve weim55 Colorado
     
  2. Feb 27, 2017 #2
    CamarosRus

    CamarosRus Veteran Member

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    The original T.C. was 6 Bolts to Flex Plate. IF you still have OEM
    Flex Plate will that be a problem.
    I'm no expert but I'm thinking same coded trans and converter were in
    LS6 Chevelles (???)
    You might posting your question at Yenko.net OR I may just fwd
    your post to LS6 GURU Rick Nelson.....
     
  3. Feb 27, 2017 #3
    weim55

    weim55 Member

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    Wow, THAT'S one I've never heard before! Never even seen a 6 bolt converter in anything other than big trucks. i'll take a look at the flywheel to see if there's evidence.

    Thanks,

    Anymore information anyone?

    Steve weim55 Colorado
     
  4. Feb 27, 2017 #4
    70lt1z28

    70lt1z28 Veteran Member Gold Member

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  5. Feb 27, 2017 #5
    weim55

    weim55 Member

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    That's great information. Thanks for the link to that. That original converter is going to be one needle in a haystack. Set up just for that one year only LT1 likely. If any of you has done an aftermarket converter for a stock LT1, be great to hear your thoughts. It,s critical to get the car to perform as it should.
     
  6. Feb 27, 2017 #6
    jimrr

    jimrr Veteran Member

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    Change the flex plate. Then get thec right stall converter.
     
  7. Feb 27, 2017 #7
    dailycruiser81

    dailycruiser81 Veteran Member

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    Take a look at FTI in Deland Fl Great guys and the owner is available to answer questions
     
  8. Feb 27, 2017 #8
    ronzz572

    ronzz572 Veteran Member Lifetime Gold Member

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    The 70 through 74 z28 camaros shared the same torque converter. So finding one is not impossible.
     
  9. Feb 28, 2017 #9
    Zulu28

    Zulu28 Veteran Member

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    This one is from my old 71 Z28, I've had this since July 1977, stall was about 2300

    [​IMG]


    [​IMG]


    [​IMG]
     
  10. Feb 28, 2017 #10
    weim55

    weim55 Member

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    Check that thing out?! It is welded externally for additional reinforcement plus the 3 additional lugs to secure the convertor to the flexplate! That's a stout factory piece! Thanks very much for taking the time to take and post those pics. This is the stuff that makes sites like this so valuable. Any chance you want to sell that to go back into an original Z28?

    Steve weim55 Colorado
     
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