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350 block

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by MA87K5, Jul 17, 2001.

  1. MA87K5

    MA87K5 1/2 ton status

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    A friend of mine bought a block for $35. I looked at it and found that it is an 86 or later block. It has a one piece rear main seal. What year did the center bolt valve covers come out and what year did the one piece main seal come out? Would it be a good block to hotrod? Thanks for any info.
     
  2. Blazer1970

    Blazer1970 1/2 ton status

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    Center bolt valve covers and one piece rear main both started in '86.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  3. Emmettology 101

    Emmettology 101 3/4 ton status

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    Some of the newer blocks did not have the hole for a mechanical fuel pump. Double check that one if you want to use a mechanical one.

    "I see, said the Blind Man to the Deaf Mute who was walking a dog with no legs!"

    <a target="_blank" href=http://www.geocities.com/emmettology101>www.geocities.com/emmettology101</a>
     
  4. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Here is the only thing (that I can think of) to watch for:

    Center-bolt valve covers mean that the intake-to-head-bolt holes in the heads are not all angled at the same rate, like a carb'd intake would be. Let me try to explain...

    The 2 intake-to-head-bolts in the center on each side of the intake are angled more perpendicular to the ground on center-bolt vavle cover engines. Older style blocks will have all 12 bolts at the same angle... most carb'd intakes use the "all same" type bolt pattern!

    Hope I didn't confuse any one other than myself!


    Does anyone else smell BFGs burning???
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
    <a target="_blank" href=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</a> [​IMG]
     
  5. Neil

    Neil 1/2 ton status

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    it should say GM LG5.7 on the flywheel housing on top if it is a 86-later 350. the GM LG5.0 is a 305 and so forth. These blocks are OK but older ones are made of heavier duty stuff. They are also cheaper for some parts. If you can get a roller cam and some LT1 rods/pistons that would be cool though. LT1 parts are easy to find...Neil H...Alabama

    Neil H. Alabama '78 K5 400ci 4x4 AT,AC,PW Cheyenne. '74 C10 3spd/floor 250ci 4x2
     
  6. MA87K5

    MA87K5 1/2 ton status

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    Thank you for the info.
     

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