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do I have a four bolt main motor?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by mpascino, May 14, 2001.

  1. mpascino

    mpascino 1/2 ton status

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    I am selling a 350 out of a 85 3/4 ton suburban. Does anyone know if that would be a four bolt main or is the only way to pull the oil pan off to find out? Thanx guys and gals

    You call that dirty!?
     
  2. wayne

    wayne 3/4 ton status

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    Pull the pan.

    <A target="_blank" HREF=http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html>http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html</A>
    <font color=blue>Happy Trails<font color=blue>
    <font color=blue>Wayne<font color=blue>
     
  3. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Get the numbers off the back of the block up next to the head (driverside?) and you can look it up here http://grimsk5s.coloradok5.com/
     
  4. Emmettology 101

    Emmettology 101 3/4 ton status

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    At one time, someone told me that if the block and a small, square top bolt right above the timing chain casting on the passenger side, then that menat it was a four bolt main. I had one motor like that and it was, but never looked into it much more than that.

    Anyone else have experience with this little bolt I am talking about?

    [​IMG] GO PENS!!!!!!!!!!
     
  5. LittlePig

    LittlePig 1/2 ton status

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    I could be way off on this, but I'm pretty sure that all the 350s GM installed in trucks were 4-bolt. As long as it is an original or truck-sourced replacement, it should still be a fourbolt. My 78 blazer has a 4bolt, as did my dad's 1/2 ton. The sub is heavier, so I don't see why they would bother with a 2-bolt when they put 4-bolts in lighter trucks.

    Email: xiaozhu@my-deja.com
    ICQ: 84108805
     
  6. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Yeah that use to be true till the crates came out. I have a crate that is 4 bolt main but that oil port is not there. According to Moretec my Crate is a 94 casting 4 bolt main Crate engine. I have two other motors that are 4 bolt that it is there but they are older blocks.

    Diging it in the dirt with my K5's
    Grim-Reaper
    <A target="_blank" HREF=http://grimsk5s.coloradok5.com/>http://grimsk5s.coloradok5.com/</A>
     
  7. chvyhs

    chvyhs 1/2 ton status

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    Check the last 3 #'s in the casting. It should be 010 for a four bolt main. Shoot me if I'm wrong.
     
  8. 79Jimmy

    79Jimmy 1/2 ton status

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    The original engine in my buddies 79 jimmy had a 2 bolt main. Its now sitting in my garage.

    James

    79jimmy@home.com
     
  9. wayne

    wayne 3/4 ton status

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    I wont shoot you but if you are talking about the 3970010 block they came in both 2 and 4 bolt. I have 2 of them that are 4 bolt and 1 that is 2 bolt.

    <A target="_blank" HREF=http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html>http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html</A>
    <font color=blue>Happy Trails<font color=blue>
    <font color=blue>Wayne<font color=blue>
     
  10. shane

    shane 1/2 ton status

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    0010 blocks were also used in more than just 350's, also the DZ302 was a 0010 block. I think you`ll have to pull the pan.

    Just keepin it Canadian[​IMG]
     
  11. Blazer1970

    Blazer1970 1/2 ton status

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    The little square headed 1/8" NPT plug above the water pump is a good indication of a 4 bolt, but not 100%. You can't tell from casting numbers. If it is the original motor from a 3/4 ton truck, there is a very strong chance that it is 4 bolt.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     

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