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305 or 350?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by k5wantabe, Sep 4, 2001.

  1. k5wantabe

    k5wantabe Registered Member

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    Currently looking at buying a 73. How can I tell for sure which engine it has. Owner claims its a 350. May well be but doesn't seem to have a lot of power. Also says only 30k on rebuild. Has 33's with 3:07 gears. also no fuel inj. Could those be factors? Engine sounds and runs GREAT. What gears should it have with 33's? I figured 3:50's would return it to stock rpm. Am I close? Want to tow a 19 ft trailer(light weight).
     
  2. Pugsley

    Pugsley 1/2 ton status

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    Almost all 73's have a carbureted 350 - injection was still 14 years away. 33's with 3.07's isn't exactly a performance combo, so you can't really tell by seat of the pants.

    1 tequila 2 tequila 3 tequila Floor
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  3. k5wantabe

    k5wantabe Registered Member

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    Thanks. I know that they didn't come out with fuel inj. (tbi) until '87. Is there any phisical way to tell the difference? I believe its the same block and such.
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I'm sure if you asked nicely dyeager535 could run the numbers off the motor and tell you exactly what it originally came out of, displacement etc...
    He ran the numbers off my motor for me.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  5. POWERMAD

    POWERMAD 1/2 ton status

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    The only way to be certain on what it is, is to get the casting # off the rear of the block on the left side and go to mortec.com and cross the #.
    I got my number by cleaning it off with brake cleaner and jamning my head back there.
    I have heard that silly putty works for getting the # too.


    <font color=green> Too bad ignorance isn't painful </font color=green>
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    My number was on the front passenger side...much easier to see. It was right behind and below my alternator.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  7. POWERMAD

    POWERMAD 1/2 ton status

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    Now i'm curious.
    Tommorrow i'll see if it is in that location.
    I am gonna feel realy dumb if it is somewhere that is easily seen.

    <font color=green> Too bad ignorance isn't painful </font color=green>
     
  8. DMK

    DMK 1/2 ton status

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    The one on the back of the block is the casting number. The one on the front pad is the engine id. I will have suffix code tells engine size carb and trans engine came with. Also has plant code and number and vin #. So these are two different numbers.
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Yeah, Dorian was able to tell me my 350 came froma 1 ton van with HD emissions, and it was from Cali...

    I already knew it was a 350 cuz I had the pan off, but the rest was news to me...[​IMG]

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  10. xnoahx

    xnoahx 1/2 ton status

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    did they make a 305 in 73?

    Check out my 73 K5 <a target="_blank" href=http://www.geocities.com/xk5blazerx/73k5.htm>http://www.geocities.com/xk5blazerx/73k5.htm</a>
     
  11. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I don't think so, but the motor could have been swapped. Hell it could be a 267, or a 307...or something equally disgusting and gutless.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  12. Pugsley

    Pugsley 1/2 ton status

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  13. dyeager535

    dyeager535 1 ton status Premium Member

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    Yeah, the suffix code is on the front of the block, on the small flat that is just forward of the passenger side head. Usually hidden behind the alternator somewhat, but if it is clean there, you can tell the suffix code from above or the side.

    Suffix code will tell you actual application (year, vehicle) and HP, as opposed to casting number, which can tell you GENERALLY what years it was used in, which doesn't do you much good if the casting number was used for 11 years in almost all GM vehicles, like some of them were (such as the 3970010 #)

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  14. 84_Chevy_K10

    84_Chevy_K10 Banned

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    305s came around during the gas crunch in 1977.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  15. i thought i read somewhere that 305s are externally ballenced like the sb 400s. if so then you could look at the harmonic balancer. it should have holes drilled in the back and kind of a weird groove on the inner lip of the balancer, like the 400s do. plus i think the ballencers on 305s are kinda small.

    <font color=blue>American Pie 2-"Have you seen my flute?" "Yeah, I stuffed it in your box."</font color=blue>
     
  16. 84_Chevy_K10

    84_Chevy_K10 Banned

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    305s are NOT externally balanced.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  17. Sh!t, sorry. guess i was WRONG.

    <font color=blue>American Pie 2-"Have you seen my flute?" "Yeah, I stuffed it in your box."</font color=blue>
     
  18. Andreas

    Andreas 1/2 ton status

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    A 305 crank has lighter counterweights than a 350 crank, and, as you know, they both share the 3.48" stroke. Just some useless info[​IMG].

    /Andreas

    406cui of pure sh*t[​IMG]
     
  19. 73_BLAZER

    73_BLAZER Registered Member

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    I had a 80 vette, in the engine number there was an H that ment it was a 305. Tom
     
  20. Neil

    Neil 1/2 ton status

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    the 3rd digit of your VIN is the engine code. R is 400, can't remember 350's. think it is C or L for 350.

    Neil H. Alabama.. "It's a full size thang, Jeep owners don't understand!!" '78 K5 400ci 4x4 AT,AC,PW Cheyenne., '74 C10 4x2
     

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