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90 5.7 blazer motor 2 or 4 bolt

Discussion in 'The Garage' started by chevyjeff, Jul 6, 2004.

  1. chevyjeff

    chevyjeff 1/2 ton status

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    does anyone know what the 5.7 motors in 90 blazers were from the factory. 2 or 4 bolt mains.
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Should be 4 bolt main if it's original.

    Rene
     
  3. Hustler

    Hustler 1/2 ton status

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    My 90 Jimmy had a 2 bolt in it.
     
  4. Derf00

    Derf00 1/2 ton status

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    4 bolt main.
     
  5. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    My 89 blazer still has the factory engine with 218,000 on it and when i dropped the pan it was a 2 bolt.
     
  6. fortcollinsram

    fortcollinsram 1/2 ton status

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    My 1987 350 had 2-bolt mains

    Chris
     
  7. muddbudd72

    muddbudd72 Registered Member

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    my 90 blazer that i bought new had a 2 bolt mains.
     
  8. Big Red

    Big Red 1/2 ton status

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    <font color="red"> well, lets see, original motor had 2bolt mains (sum reason dunno why) new motor (well, rebuild of another block) is 4-bolt mains. seems GM had a hard time figuring out which blocks went where...usually, the heavy duty burbans got the 4-bolt mains...dun see too many blazers wit 4bolts. /forums/images/graemlins/yikes.gif </font>
     
  9. Derf00

    Derf00 1/2 ton status

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    Well mine was a 4 bolt main when rebuilt to a 383.
     
  10. daleearnhardt01

    daleearnhardt01 1/2 ton status

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    Haha sounds like its luck of the draw... /forums/images/graemlins/tongue.gif /forums/images/graemlins/screwy.gif /forums/images/graemlins/screwy.gif /forums/images/graemlins/screwy.gif /forums/images/graemlins/screwy.gif
     
  11. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    [ QUOTE ]
    Haha sounds like its luck of the draw...

    [/ QUOTE ]

    Sounds like the trucks got whatever happened to be handy when being built. Craziness...

    Every truck sbc I've seen apart was 4 bolt mains, including the 350 from my Jimmy. As I understood it only passenger cars got the 2 bolt mains unless it was a high performance application. I guess the reality is that it was a crap shoot, and most customers would never find out one way or the other anyways... /forums/images/graemlins/whistling.gif

    GM is/was a weird company.

    Rene
     
  12. Corey 78K5

    Corey 78K5 1 ton status

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    As far as I know Blazers that came from the factory with a towing package got the 4 blt mains. Which to Me makes since.
     
  13. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Prolly just the K5's built on Tuesdays and Thursdays...unless it was beige and had power windows, then it got 2 bolt mains.

    /forums/images/graemlins/whistling.gif /forums/images/graemlins/whistling.gif

    Rene
     
  14. POWERMAD

    POWERMAD 1/2 ton status

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    /forums/images/graemlins/histerical.gif /forums/images/graemlins/histerical.gif
     

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