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Engine Question.

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by rocko, Feb 9, 2001.

  1. rocko

    rocko 1/2 ton status

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    I know this may be a long shot.. Here's my question..
    Are all chevy truck engines 4bolt mains?
    I might be buying a 1977 Suburban 3/4 ton with a 350 in it.. I'm not sure if it's original.. I'm going to find out this weekend I hope..
    I'm just hoping it's a 4 bolt main engine...
    Thanks guys..


    It's better to have it and not need it, than to need it and not have it.
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    No, just on the technicality that there were no 4 bolt 305's : ) I think your chances are pretty good its a 4 bolt if its out of a 3/4 ton though. Only way to know for sure is to pull the pan. If it turns out to be, why not pull the suffix codes off it and let us (or me) know. I'm betting that if one block with suffix code "XXX" had 4 bolt mains, so did every other block with the same suffix code. I'm thinking of putting a list together of suffix codes w/ 4bolts. Casting number alone, as I'm sure you know, is not usually an indicator of 4 bolts, as most 4 bolts i know of, have a casting number that COULD be either a 2 or 4 bolt. Take heart if its a 2 bolt, if you install splayed main caps (aftermarket) that is stronger than a factory 4 bolt.

    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. Chris Demartini

    Chris Demartini 1/2 ton status

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    <font color=blue>I know for a fact that you can tell how many bolts the main cap has from the code. When my old motor took a dump, I took the # to a chevy dealership and they told me it was a 350 4 bolt from a 79 1/2 ton truck.</font color=blue>

    [​IMG]
    <font color=blue>pavement queen with shinny paint job and car tires</font color=blue>
     
  4. gokartergo

    gokartergo 3/4 ton status Staff Member Moderator

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    You could also take the VIN # to a chevy dealer and they could tell you. If the motor hasn't been changed.

    Become one with nature.............Then marinate it...
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    So what your saying is that GM dealers have access to a database of suffix codes, and from that, they will know whether its a 2 or 4 bolt? thats very cool...just wish I could get my hands on that database : )

    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>
     
  6. jarheadk5

    jarheadk5 1/2 ton status

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    My uncle's mid-80's 3/4-tonSuburban came with a 4-bolt 350. He was surprised, but happy, since him and his mechanic were checking that to decide which blower pulley to install...

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  7. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Hey Rocko
    Try this site, I believe if you have the casting numbers you'll find out if its a 4 bolt block or not here <A target="_blank" HREF=http://www.mortec.com/castnum.htm>http://www.mortec.com/castnum.htm</A>

    Rene

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