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engine identification?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by C5K5, Jan 3, 2002.

  1. C5K5

    C5K5 Registered Member

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    Hi all-
    New guy, first post. Just picked up an 86 Blazer with a V8, but don't know which one. I don't trust the VIN or the emissions sticker (says 305) at face value, since enthusiasts are yanking engines all the time anyway, but it could be. Is there a stamping or code in the casting anywhere on the block that would tell me for sure?

    Thanks! I look forward to participating more as I learn anything useful....

    Happy New Year!
    c5k5
     
  2. RaisedK5

    RaisedK5 1/2 ton status

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    Someone correct me if i'm wrong, but it should be cast into the top of the block right behind the driverside head, probably covered in grime, should be in liters, 305 = 5.0, 350 =5.7, but like i said somebody correct me if im wrong.

    Leland aka RaisedK5

    "Of all the things I've lost, I think I miss my mind the most!"
    "Are the voices in my head bothering you?
     
  3. POWERMAD

    POWERMAD 1/2 ton status

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    Mine was just a casting # there. and I found that I had a 305.
    <a target="_blank" href=http://www.mortec.com>www.mortec.com</a> will have the casting #'s.


    <font color=green> Too bad ignorance isn't painful </font color=green>
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    You want the suffix code to be absolutely certain what the motor's application was. (the same block castings were typically used in many different applications, although usually they are displacement specific, but not always) Front passenger side, just in front of the head, usually partially obscured by the alternator. You need the 3 letter code that is located there, and you can decode that at www.dorianyeager.com/index2.html
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  5. C5K5

    C5K5 Registered Member

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    Great...thanks a lot. Next, I'm off to read some from the TBI threads....

    c5k5
     
  6. Scooter

    Scooter 1/2 ton status

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    Thanks for that link Dorian .. between that site and the machine shops "magic" cross reference book i was finally able to ID my block and heads .. great info there

    Scot in KC, MO
    87 GMC - 4", 33s, 3.73 10B/14SF
    http://community.webshots.com/user/sdb95
     
  7. Luehrs1

    Luehrs1 Registered Member

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    Heads Identification

    Is there a way to identify what cylinder heads are on the engine?

    Patrick
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    I believe casting number is the only way to do that, short of the cast in ID markers on the end of the head. Like my Vortecs, which have "sawteeth" (three triangles in a row) or "double hump" heads. I *believe* all stock heads have some sort of markers like this, but I am not sure that anything on the heads is an "exact" ID...valve sizes can differ, chamber size, etc.

    Someone else may be able to comment on casting number vs. chamber size, valve size, and so on, and whether casting number indicates EXACTLY those specs.
     
  9. Thunder

    Thunder 3/4 ton status

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    The only way to properly ID chevy heads is to pop the valve covers and check the number stamped/cast in the center of the heads.
    BUT
    Here's a site that gives some of the markings on the end of the head to ID them. It has most all sbc GM heads. it L prolly save you from pulling the valve covers.
    Chevy head ID
     

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