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350 Engine Swap

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Mingler, Feb 23, 2002.

  1. Mingler

    Mingler Registered Member

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    Looking for a little info.
    I'm running a 87 K5 with a 305 and a 700r4 tranny.
    I'm looking at swapping in a 350. First off, what are the MAJOR road blocks i should what out for? Secondly, What do i need in order to keep the TBI? I know Holley puts out a replacement TBI system that uses the existing wiring, but what about the fact that the engine will be bigger?
    What about the Tranny, Will i need a new torque converter? Being that the current config is two bolt, is there anything wrong with keeping with the Two Bolt when buying a 350? Or should i look at finding a new tranny at the same time??

    I've got just a ton of questions. If you got the time and the knowledge, drop me a email. I would be all ears.

    sorry for the TON of questions. Any help would be GREATLY appreciated.

    Thanks Guys.
    Mingler55@hotmail.com
     
  2. MOABDADC22

    MOABDADC22 1/2 ton status

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    It should be a straight bolt in project. As far as the TBI, the stock intake and TBI should work. You can check with some of the other guys and see, but I think it will work. If not, you could get the ECM tweeked to fool the computer. The converter should be the same too. You can buy either a two bolt or a four bolt main 5.7 liter engine from 87-up.

    <a target="_blank" href=http://www.moabdadc22.alloffroad.com/>http://www.moabdadc22.alloffroad.com/</a>Real four wheelers don't need tools to remove body panels, paint, tail lights..etc.
     
  3. MOABDADC22

    MOABDADC22 1/2 ton status

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    P.S. Fill out your profile.

    <a target="_blank" href=http://www.moabdadc22.alloffroad.com/>http://www.moabdadc22.alloffroad.com/</a>Real four wheelers don't need tools to remove body panels, paint, tail lights..etc.
     
  4. Hossbaby50

    Hossbaby50 3/4 ton status

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    When the 305 came out of my Jimmy for a 350, I needed a new flywheel. Everything else bolts up I think. There should be no problems with the tranny. I don't know about the computer though, mine is a carb. I would think though, if you got a chip set up for a 350 you should be fine. But don't know for sure. Get new motor mounts, water pump, and all the other acessory parts that tend to wear out and replace them while your at it. It will save you alot of headache. It would suck to have a new 350, and have a water pump go out, or something stupid like that.

    My Chevy isn't broken, its just out of gas.
     
  5. txbartman

    txbartman 1/2 ton status

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    I agree with everyone else on this one. Just swapped my 305 for a 350. Mine was easier, though, as I have a carb and no computers to deal with. But, if you have any problems, just get a new chipset.

    Go with a 4-bolt main. They are stronger and will last longer. Replace whatever you can when you do the swap as it will be easiest to do with the engine out. You will probably need a new flexplate, but check with whomever you are getting the engine form on this one. Otherwise, direct bolt in.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  6. Mingler

    Mingler Registered Member

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    So from you guys are telling me is that's it's a walk in the park??
    Next question. Anyone got a good 350 kickin around? :)

    I've got a line on a fresh rebuilt for $1700.00
     
  7. 4x4blazer

    4x4blazer 1/2 ton status

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    $1700.00 is too much for a rebiuld. If your gonna spend that much, just get a BRAND NEW crate 350 from GM. They sell a long block with 330hp for $2000.00.
     
  8. sosamantx

    sosamantx 1/2 ton status

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    most of what these people said is correct. (2 bolt converter??), you might need a new flexplate if your block is a 2 piece rear main seal, and the new block is a 1 piece rear main seal. if yours is the same it should work then. so basically check out the rear main seal and determine type, also what type of heads (vortec type) are a different bolt pattern, so all new stuff there (intake manifold, brackets), and exhaust might not fit (I have a post here "vortec motor swap", or something to that effect, also some heads had the center bolt holes positioned differently than most heads (check this out). the harmonic balancer is different between a 305 and 350 (pretty sure). so, i'd basically say to do your homework if you want it to be straightforward. i don't know anything about the TBI, so i can't help there.

    <font color=blue>Steve Sosa a.k.a. "sosaman"</font color=blue>
    <a target="_blank" href=http://sosaman.home.texas.net/carpics.html>http://sosaman.home.texas.net/carpics.html</a>
     

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