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how do I find a flexplate for my BIG BLOCK

Discussion in 'The Garage' started by MEGALADON, Oct 24, 2005.

  1. MEGALADON

    MEGALADON 1/2 ton status

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    I pulled a 454 and 400 trans from a 78 GMC, I put the 454 in my 82 GMC,
    the flex plate would not line up with the 350 trans, so I grinded the hole larger
    and noticed a vibe, I am getting ready to stick my 700R-4 in, how do I know what flex plate to install so the bolt pattern lines up with the flex plate???
    I gues the original flexplate was only for the 400 trans!! But i'm no specialist.

    Will this be one of those trial and error problems for me, I'm pretty sure a flexplate is out their, that would work.

    For what I understand, the motor is externaly balanced
     
  2. gauder

    gauder Banned

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    You need an externally balanced flexplate for a 454, get one with a dual bolt pattern for converters (10.75" and 11.50") and you should be fine.
     
  3. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    contact Summit racing for one.
     
  4. sweetk30

    sweetk30 professional hooker Premium Member

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