Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

454 flywheel question

Discussion in 'The Garage' started by big83chevy4x4, Oct 14, 2006.

  1. big83chevy4x4

    big83chevy4x4 3/4 ton status

    Joined:
    Mar 22, 2002
    Posts:
    6,587
    Likes Received:
    0
    Location:
    Sheridan, Michigan
    last week i bought a 99-00ish vortec 454 (gm test motor, has some not so 454 items on it, more like 496 stuff on it.) ive been looking for a flywheel but i can't figure out what fits. some web sites say all 454 flywheels are the same, some say up to 90, then 91 on are the same, some say up to 90, 91-95, and 96 on.

    GM sells a flywheel for this for around $100, but it says 11" pressure plate pattern. i want to put a 12" clutch on it. if my local dealer had one in stock, id just take a measurement to see if a 12" clutch will fit. but they don't and if i order it, im stuck with it.

    anyone know if it will fit or know of what flywheel that will fit the new 454 and a 12" clutch?
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,982
    Likes Received:
    191
    Location:
    Roy WA
    I hope someone will post up about the clutch size. I had always heard there were only two sizes, 11 and 12", but then found out that one is something like 10.4" or so.

    It MIGHT be that the GM piece is 11.4 or something, and that's what everyone calls a 12"?

    Ring gear count will tell you if it's a big or little flywheel, 168 tooth is big, 15x is small. Unsure if the tooth count changed later on.
     
  3. big83chevy4x4

    big83chevy4x4 3/4 ton status

    Joined:
    Mar 22, 2002
    Posts:
    6,587
    Likes Received:
    0
    Location:
    Sheridan, Michigan
  4. JEBSR

    JEBSR 1/2 ton status

    Joined:
    Dec 23, 2004
    Posts:
    1,541
    Likes Received:
    0
    Location:
    Clarksville, TN
    This is what I found. I thought the only differance was whether it was a 1 piece or two piece rear main, but maybe not. I see three differant types and they seam to be interchangible only in between the specific year models.

    http://www.coloradok5.com/forums/archive/index.php/t-123526.html

    http://store.summitracing.com/partdetail.asp?part=HAY%2D20%2D330&view=32&N=700+115&orig=1

    http://store.summitracing.com/partdetail.asp?part=RAM%2D2532&view=32&N=700+115&orig=1

    http://store.summitracing.com/partdetail.asp?part=MCL%2D460130%2D4A&view=32&N=700+115&orig=1
     

Share This Page