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How to tell the difference between v8s

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by mud390, Nov 6, 2002.

  1. mud390

    mud390 1/2 ton status

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    I have a 77 k5. The vin codes the engine to be a 305. When I purchased the truck I was told the original engine was replaced with a 350, which is obviously a much better engine. I really don't know which engine is in the truck. What is the easiest and most accurate way to tell which engine I have? I know its not a 400 because it is not externally balanced. Thanks for your help!
     
  2. imiceman44

    imiceman44 1 ton status

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    My 350 was stamped with a 350 on the block, I forget what side, just under the exhaust manifold if I remember correctly.
     
  3. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Casting numbers on the block. This will tell you the type of block (350, 305, etc) but it won't tell you things like if it's stroked, bored, bumped compression, etc. Then do a search on the net, there are several sites for looking up casting numbers, I'm sure somebody will know off the top of their head (unforetunately I don't).
     
  4. Sandman

    Sandman 3/4 ton status Author

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    Heres a great listing of Chevy numbers:

    Mortec
     
  5. Rolled

    Rolled 1/2 ton status

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    Casting numbers can only tell you so much. They used same cast numbers for different displacements. What you need to do is get the suffix code along with the casting number.

    I have an extensive list of suffix and casting codes if you need help.
     
  6. 4x4dreamer

    4x4dreamer 1/2 ton status

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    Put Yer foot in it...you'll know if it's a 350 vs. 305. /forums/images/graemlins/thumb.gif
     
  7. Sandman

    Sandman 3/4 ton status Author

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    Do you know of an online source for the suffix codes?
     
  8. Blazer1970

    Blazer1970 1/2 ton status

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  9. Sandman

    Sandman 3/4 ton status Author

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    Thanks. I bookmarked it. /forums/images/graemlins/thumb.gif
     
  10. R72K5

    R72K5 Banned

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    quickest way i tell is by the balancer size, if its 8" diameter and about 1.5" wide then its 350, if its about 2" wide and 7" diameter then its 305

    400 use same size balancer as 350 but has solid back instead of hollw back

    307 327 283 265 all use tiny skinny balancer


    but even this rule of thumb has loopholes, previous owners can swap wrong balancer on SBC


    good luck
     
  11. mud390

    mud390 1/2 ton status

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    Thanks for all the info. I will definately be crawling all over the motor this weekend checking on all the things you guys listed. Thanks again!
     
  12. imiceman44

    imiceman44 1 ton status

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    You're welcome /forums/images/graemlins/thumb.gif
     

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