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Choosing A Flexplate

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Resurrection_Joe, Jan 27, 2002.

  1. Resurrection_Joe

    Resurrection_Joe 1 ton status

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    I'm almost 100% sure that I need a new flexplate, and am going to try and get it on myself. I'm just wondering which brand I should go with. I have a 78' 355 mostly stock. What's the tooth count I need? Thanks a lot!

    1978 K20 - 355ci, np205, th400, D44, 14F, 7" of Lift, 36 x 14.5 TSL Radial
     
  2. konajoe

    konajoe 1/2 ton status Premium Member

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    RJ,
    Check your starter…

    GM starters use
    153 tooth 12 ¾” flywheels straight across bolt pattern

    168 tooth 14” flywheels offset bolt pattern

    Hope this helps, [​IMG]
    Joe
    79K10
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    Never heard of a 14" flywheel. You sure you didn't mean 10.4 and 12"? (probably not exactly 12" either, but thats all I've ever heard) You are corect though tooth count/diameter governs the starter nose/block mounts you use.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     

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