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Swapped Big Block owners....

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by morphed86k10, Jan 3, 2003.

  1. morphed86k10

    morphed86k10 1/2 ton status

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    Those who have swapped a big block, what did you do for a clutch setup? I'd like to keep my existing clutch but am not sure if I can get a correct flywheel, and then there is the strength issue. Is a 11" clutch enough to stand up a big block (if driven properly) or should I spring for a 13" clutch? My 11incher is pretty new or I wouldn't even ask.
     
  2. Sandman

    Sandman 3/4 ton status Author

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    The 11" should be fine. I've ran 11" clutches on 454's with no troubles. Yu might wear it out faster depending on driving style and such but if your already got one, I would throw it in.
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    You only have a choice between 11 and 12" AFAIK (and really, those sizes aren't exact, but what I just saw in an older GM dealer brochure)

    You can't do anything but fry the 11 inch flywheel/clutch, and a used clutch doesn't net you much $$ anyway, so I'd just run it and try to take it easy.
     
  4. Sparky87k5

    Sparky87k5 1/2 ton status

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    I run a 168 tooth flywheel and 12" clutch in my small block and now run the same size in my new big block powered. Didn't know there was a 11" option. Wouldn't worry about the 11" not being strong enough unless you're really hard on clutches.
     
  5. Zeus33rd

    Zeus33rd Smarter than you GMOTM Winner

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    I swapped a 402 big block into my truck. Also just swapped in a 465/203 combo. Since my 402 is balanced like a SB 350, I got a good 12" (technically 11 7/8") flywheel from a 350 from a bud, and got it surfaced. IIRC, the 396, 402, and 427 big blocks are balanced the same as the small blocks with the exception of the 400. The SB 400 and the BB 454 are balanced the same. The clutch I'm running is the 12" CenterForce II. I don't see why you'd have a problem with the 11" clutch. I think the 11" was actually available behind the big block. Just as long as it will bolt to the flywheel, You'll be ok. /forums/images/graemlins/pimp1.gif
     

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