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350 or 305

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 4x4k20, Apr 16, 2001.

  1. 4x4k20

    4x4k20 1/2 ton status

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    i have an engine that came out of a 86 k5 the sticker under the hood says 305 but i tore eng down it has a 4bolt main they didnt build 305s with 4 bolt mains or did they ?

    4x4k20
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    check out my web page for the casting number links. I believe the 305 has either 305 or "5L" (5 liter) cast into the back of the block, behind the flexplate.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  3. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    From what I've heard, 305's DON'T come with a 4-bolt main. That's only one of the reasons my next motor wil be a 350........



    <font color=red>PHOTO ALBUM-</font color=red> <A target="_blank" HREF=http://albums.photopoint.com/j/AlbumList?u=1289798>http://albums.photopoint.com/j/AlbumList?u=1289798</A>.......<font color=blue>TRUCK & HIKING PICS</font color=blue>
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    AFAIK the 305 has a smaller bore than the 350...if you have it tore down just measure the bore. If its 4.000 or a little over its a 350...under 4.000" (like 3.750") then it should be a 305.
    The stroke is the same.

    Rene

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>
     
  5. jimmyjack

    jimmyjack 1/2 ton status

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    On the left rear of the block there will be a stamp. 5 or 5.7 5.7 is a 350.

    "My blazer may be slow, but it goes faster at higher speeds"

    Jim
     

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