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Fly Fly Flywheel don't fit!~

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by noahrob, Dec 24, 2006.

  1. noahrob

    noahrob 1/2 ton status Author

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    Ok, Here is the deal, I am putting a TPI 350 (1987 Formula) into my 73 blazer which had a carbed 383...I run a SM465 mated to a 205. I put in the pilot bushing and was about to put the flywheel where the flex plate was when bam, the bolt holes don't line up on the crank. My flywheel has a center hole of 2.5 inches and the crank on the new engine wants 2 inches. The flywheel and flexplate are both 14 inches in diameter (and I run a 12 clutch) so I am confused...Is this simply the difference between 153 tooth and 168 tooth flywheels?

    Anybody got a bead on the correct flywheel...
     
    Last edited: Feb 8, 2007
  2. noahrob

    noahrob 1/2 ton status Author

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    Shame on me.. .I think the answer is that in 1985 or 1986, chevy changed the bolt pattern and since I am going frmm a 1973 block to a 1987 block wham...I need a new flywheel. What do you think...?
     
  3. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Yep, you figured it out. When GM changed to the 1 piece rear main seal starting in 1986 the bolt circle changed as well.
     
  4. noahrob

    noahrob 1/2 ton status Author

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    Damn you GM engineer geeks!!!

    Hmm...anybody know where to buy the new flywheel for cheap?
    Anybody need a good flywheel for ht etwo piece main engines or a flexplate for the new one piece main?
     
  5. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Well, you wouldn't have been able to use the flywheel anyhow as a 383 is externally balanced and is different than the external balance of the later style 350's with the 1 piece rear main.

    Here is the GM part number for a flywheel with a 1 piece rear main seal engine. 10105832
    Summit Racing #RAM-1530 = 269.95 for a steel flywheel or RAM-2530 = 429.95 for an aluminum flywheel
     
    Last edited: Dec 24, 2006
  6. noahrob

    noahrob 1/2 ton status Author

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    Hey, Thanks man...I looked up the part number and it seems it is a 12" flywheel...I am currently running a 14" er, but I will check out summit and jegs. Thanks again...
     
  7. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    These are both 14" flywheels.
     
  8. noahrob

    noahrob 1/2 ton status Author

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    Last edited: Dec 24, 2006
  9. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Where did you come up with the replacement number of 14088648? I got the 10105832 right out of the current 2006 GM performance parts catalog.
     
  10. noahrob

    noahrob 1/2 ton status Author

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    I found it on the internet on som esite, but now I can't remember where...I was able to find the part on Summit and SPDC, but am not sure of the difference...it almost looks like the 10105832 is the steel version and the 14088648 is cast iron?

    Anyway, I think I want the 10105832...although the other one is much cheaper.
     
  11. dyeager535

    dyeager535 1 ton status Premium Member

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    GMPD sells the 10105832 for $190...
     
  12. noahrob

    noahrob 1/2 ton status Author

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    Now I remember, I couldn't find 10105832 at Jegs or Summit and somehow through an application search, I found 14088648
     

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