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TBI Swap

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BMR, Mar 4, 2001.

  1. BMR

    BMR 1/2 ton status

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    What is all needed from a donor truck to do a Carb to a TBI system? Intake, TBI unit, computer, wireing, sensors, and electronic fuel pump. What else is there? Am I missing something?
     
  2. fr8train

    fr8train 1/2 ton status

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    You have the basic list. I would snag the enitre gas tank w/ sender cause it has all the fittings needed. Have your injectors tested/replaced to save you some hassle later on. Also get a new O2 sensor. I know I am forgeting something so I will get back to you.

    [​IMG]
     
  3. Glenn

    Glenn Registered Member

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    The distributor. The whole harness. And lots of paitence.:-)
     
  4. K5 NUTT

    K5 NUTT 1/2 ton status

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    Howell harness $325 - Howell speed sensor $85. MAP-KNOCK-ESC-EGR Bleed Solenoid-o2-Coolant temp-IAC-TPS sensors. Junkyard manifold and tbi unit...or adapter plate from Howell...rebuild the tbi. 7747 ecm with stock 87 to 91 K5 prom and calpak...87-91 baffled fuel tank...prefered but no necessary..its the way i went...they are $250 my price at the dealer...$380 over the counter so a bone yard tank with a good baffle is the way to go...sending unit is another $200 at GM...so there again search the bone yards...also the 88 up C30 p/u's with flatbeds and such had either the 18 gallon saddle tank or 31 g tank...the 31 g tank is the same as the K5...then you need a 87 up small cap efi hei distributor...and a coil. I think thats about it but i'm sure i have forgotten something....just picked up 2 dist on Ebay for around $50 a pop...came with cap coil and wires...they are $150+ at the dealer. Hope to have mine done my mid month or so...still lacking a few parts...want to swap out to the serp belt set-up as the big A-6 compreesor will not work with the tbi manifold.

    Azblazer

    1979 K5
    1976 K5 Chalet
    1972 K10 Suburban
     
  5. realsquash

    realsquash 1/2 ton status

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    You will want to get an aftermarket cal-pak that has VATS diabled or you'll never get your engine started. Also, don't forget to buy an ECM (1227747).

    Squash
    <A target="_blank" HREF=http://www.trailrunners4x4.org/users/realsquash>http://www.trailrunners4x4.org/users/realsquash</A>
     
  6. pcorssmit

    pcorssmit 1/2 ton status

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    The factory harness from an '87-'91 RV series truck is the easiest to work with, all the wires are the right length and the bulkhead connector is the same (at least back to '83). I did have to move a few of the wires in the bulkhead connector to match them up. Don't remember what VATS is (security system?), but mine runs fine with the stock cal-pak from the '87 donor truck. I'm also using the stock '83 VSS, but I did swap the buffer out for one out of an '84 Caprice w/cruise and a feedback carb, the feedback carb computers used the same VSS signal as the TBIs. I paid $1250 for the motor w/ all accesories, computer, harness, sensors, etc, and the gas tank from a wrecking yard about 4 years ago. Its also a good idea to replace the fuel pump (assuming you buy a used tank). The older (long) style AC pump can work with the TBI manifold, but the bracket to the center manifold bolt doesn't line up. Also, if I remember right, the stock TBI manifold's center four bolts are at a different angle than older small blocks. '87 motors used v-belts and one serpentine for the alternator, not sure about '88, '89 used the single serpentine. The HELM manual is mandatory reading when doing this swap.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  7. Emmettology 101

    Emmettology 101 3/4 ton status

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    Everyone here covered it pretty well except you dont have to buy the manifold if you dont want to. There is an adapter available from Turbo City that will allow you to bolt a TBI to your stock 4bbl manifold.

    My buddy is doing this swap also.

    HTH

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>
     
  8. jarheadk5

    jarheadk5 1/2 ton status

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    I think JTR (Jaguars That Run) has a really good book to use as a reference for a swap like this. The title is something along the lines of "How To Install A TBI Smallblock Into Just About Anything". The guy that wrote the book swaps TBi smallblocks into Jaguars, Land Rovers, and stuff like that. You can find ads for them in the back of Hot Rod, Car Craft, Popular Hot Rodding, and other mags.

    [​IMG] Semper Maintenance!
     
  9. HarryH3

    HarryH3 1 ton status Author

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    I've still got the VATS chip in my computer. I know how to start it, but a thief would never figure it out! [​IMG] I could even hand 'em the keys and it wouldn't start for 'em.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  10. HarryH3

    HarryH3 1 ton status Author

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    You can check out the Jags That Run website at <A target="_blank" HREF=http://www.jagsthatrun.com/>http://www.jagsthatrun.com/</A>

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  11. det45

    det45 1/2 ton status

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    I have a TBI intake off of my 89 K5, It's yours for $20.00 plus shipping...Det45

    One Fine 89.....
     
  12. pcorssmit

    pcorssmit 1/2 ton status

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    Holley Pro-Jection TBI Adapters have the same bolt pattern also. The Holleys use a bigger bore TBI, so a GM TBI will work on their manifold, but a GM Manifold needs to be bored out to work with a Pro-Jection TBI.

    I have the JTR book, it is a good resource, but it is more focused on TPIs. (Unless they have a newer TBI only book).

    Pete
    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  13. realsquash

    realsquash 1/2 ton status

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    Well there are ways, but i'd rather have no vats to worry about :)

    Squash
    <A target="_blank" HREF=http://www.trailrunners4x4.org/users/realsquash>http://www.trailrunners4x4.org/users/realsquash</A>
     
  14. HarryH3

    HarryH3 1 ton status Author

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    I like knowing that no one else can drive away in my baby. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     

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