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identifying what motor i have

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by scrappyk5, Apr 2, 2002.

  1. scrappyk5

    scrappyk5 1/2 ton status

    Mar 17, 2002
    Likes Received:
    the k5 i have purchased originally came with a 305. the guy i
    bought the blazer from , said the previous owner put in a 1988 350. it has the quad carb system and all the v belts,
    so i am assuming that all the stuff was switched. there is
    no fuel pump on the block and it has an inline electric fuel
    pump with a regulator. how do i find out for sure what i have
    so i know what i am dealing with when i need to get parts
    for it?. is there markings that i can go by to distinguish the
    displacement along with what year it is? thanks
  2. Quack_Addict

    Quack_Addict 1/2 ton status

    Feb 24, 2002
    Likes Received:
    The casting number on the back of the block by the distributor is the best way to identify any GM engine. <a target="_blank" href=http://www.mortec.com>http://www.mortec.com</a> correlates the numbers to what the engine is.

    I think you can also tell a 305 from a 350 by the harmonic balancer - a 350 balancer is larger (I think) than on a 305... someone could have changed the balancer, though.

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