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Re-Gasketing the 350 ???

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by reddog64, Oct 11, 2001.

  1. reddog64

    reddog64 1/2 ton status

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    I've got a new/used 350 to drop into my project and am going to tear it down to a short block and regasket it all...

    My question is this... I dont have to remove the crank to replace the main seals on the front n rear of the crank do I ??
     
  2. ftn96

    ftn96 1/2 ton status

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    Depends on if it is a 2 piece or 1 piece seal.
    On the 2 piece, no, 1 piece yes.

    Surgeon General's Warning:
    Viagra and steroids may be harmful to your spouse![​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  3. reddog64

    reddog64 1/2 ton status

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    anyway to tell if it is one or two... it's a 1977 block maybe a 78...
     
  4. ftn96

    ftn96 1/2 ton status

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  5. Triaged

    Triaged 1/2 ton status

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    They didn't start using 1-piece seals till '87.

    '71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
    <a target="_blank" href=http://community.webshots.com/user/triaged>See it Here </a>
     
  6. Blazer1970

    Blazer1970 1/2 ton status

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    Even with a 2 piece rear main you do not have to remove the crank to replace the rear seal. Just remove the rear main bearing cap, and you can push the top half of the seal around the crank to get it out.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  7. Mr.Chevy4x4

    Mr.Chevy4x4 1/2 ton status

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    Actually the one piece seals started in '86. Either way you don't have to remove the crank shaft to relpace the rear main seal. For the two piece design you will have to remove the oil pump and the rear main cap. The front seal is in the timing cover.

    '85 K5 : Run it til it breaks, then fix it and go again!
     

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