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383 Stroker with stock TBI

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by purple89jimmy, Jun 23, 2001.

  1. purple89jimmy

    purple89jimmy Registered Member

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    If I wanted more torque and power out of my 350, could I put a 400 crank in it and still keep the tBI?
     
  2. 1990K5

    1990K5 1/2 ton status

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    i want to know the same thing, i think you can if you dont go overboard on the cam. anybody?
     
  3. shawnboy

    shawnboy 1/2 ton status

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    I put a Chevy crate motor in my '88 and didn't want to void the warranty but yet wanted more of what you seek. Here is what I did. I think you will find this a little easier with less down time for your rig.
    First upgrade your gears. I went from 3.08 to 3.73 on 33" tires. Next was a Hypertech stage 2 chip with a 165 degree thermostat. I found an MSD coil worked well at burning things but don't forget to regap your sparkplugs to at least .045- .050 or it will run to hot and you'll have missfires. Adding a K&N filter charger system really helps as well. Also, don't forget a low restriction dual exhaust system or your chip won't do it's job. I then installed a B&M shift kit and cooler. The results from these few minor upgrades resulted in neck snapping throttle response, the ability to go faster than most people are comfortable with and believe it our not, a noticable increase in your gas mileage. You will have to run 91 octane or higher though or the little engine gremlins will start knockin' at your door. This might seem to be a lot of work but really it isn't compared to ripping into your engine. I promise that you will be impressed.
    Enjoy, Shawnboy.
     
  4. jarheadk5

    jarheadk5 1/2 ton status

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    Direct answer to your question: I don't think so. You'd almost definitely need a custom chip to get the benefits of the TBI. The throttle body itself may need a little work to keep up with the motor's demands for fuel & air. Turbo City (<A target="_blank" HREF=http://www.turbocity.com>http://www.turbocity.com</A>) is the TBI experts, they could give you some more definite answers.

    <font color=red>Click those banners and help support CK5!!<font color=black>
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  5. Thunder

    Thunder 3/4 ton status

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    Or try these guys<A target="_blank" HREF=http://www.fastchip.com>http://www.fastchip.com</A>
    They will build a chip for just about any custom GM engine
    Turbocity is good too. They build a nice TBI
    If your putting the money to build a strokerYou might as well get bigger TBI to feed that engine.
    <P ID="edit"><FONT SIZE=-1>Edited by Thunder on 06/24/01 10:37 AM (server time).</FONT></P>
     
  6. Cavalry

    Cavalry 1/2 ton status

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    Contact realsquash on here....he really knows his stuff when it comes to burning custom chips etc

    "There is a fine line between hobby and mental illness"
    Luke
    84 K5
     
  7. CaptCrunch

    CaptCrunch 1/2 ton status

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    I doubt it will work very well... a good option maybe to talk to turbocity about the larger TBI unit and some larger injectors. (Many guys have just used a 454 TBI unit which is essentially the same thing) Another thing to look at is what heads are on the 383... old style pre 86? The FI/TBI heads? Vortechs? Alll there take a different intake manifold and cost may become an issue w/ keeping the TBI. Another thing to look at is if the crate engine has a knock sensor provision. It may or may not depending on your application. A custom burnt chip is a good idea and you could always set up the chip to eliminate the spark issues and go w/ a MSD box or whatever. Realsquash has some sweet info on building a custom port injection setup... alll the links are off his home page
    http://www.geocities.com/milnerlives_2000/blazer.htm
     
  8. Emmettology 101

    Emmettology 101 3/4 ton status

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    I have a friend that tried that. Although I think he may have been running too big of a cam. It ran alright, but I dont htink it had the power it should have had. He eventually took off the TBI and went with a carb set-up.... It may have run better if he would have had a chip burnt for the comp, but he never did.

    <font color=green>MIKE</font color=green> - "Hukd on fawnics,werkd fer me!"
    <A target="_blank" HREF=http://www.geocities.com/emmettology101>http://www.geocities.com/emmettology101</A>
     
  9. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    One of the hot road mags had an article about this awhile back. It was done on a '91 truck I believe. The owner had to send it into TurboCity for computer work. Contact Squash, he knows all of this good stuff, I can give you the basics of just getting software and cable and hooking into the computer.

    "I am Republican. Not a baby-killing, tree hugging, land grabbing, touchy feely, hypocrite wuss democrat!"
     
  10. walt88

    walt88 1/2 ton status

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    Hey, BRBoudreaux, I don't think anyone wants to or cares about your political views. You should change your sig. Thats not what this forum is for.

    <font color=red>1988 Chevrolet K5 Blazer, Middletown, NJ (07737).</font color=red>
     
  11. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    Check your private message box.

    "I am Republican. Not a baby-killing, tree hugging, land grabbing, touchy feely, hypocrite wuss democrat!"
     

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