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383 and TBI

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by timebomb1602, May 10, 2001.

  1. timebomb1602

    timebomb1602 1/2 ton status

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    Hey can I build a 383 to work with my computer and TBI setup? If so what comp or thottle body mods need to be done? Anyone runnin this set-up?

    <font color=red>1991 GMC Jimmy 350tbi 3.42</font color=red>[​IMG]
     
  2. Brian 89KBlazer

    Brian 89KBlazer 1/2 ton status

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    There's guys here who've done it so they can better answer but you'll need a bigger throttle body & a chip. That should pretty much cut it.

    Brian
    89KBlazer
     
  3. mattman

    mattman 1/2 ton status

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    Also, there was a write-up in the Q&A section of I think last month's Hot Rod that answered this too. (or maybe the month before). They talked to Turbo City and they had all the answers. Almost looks and sounds too easy. Might be able to find it on the Hot Rod website (forget the address).

    90 GMC Jimmy, 350 TBI, 700R4, 32's
    84 Bronco II 204,000 miles and counting...........that's 205,000 and counting now
     
  4. 2Dogs

    2Dogs 1/2 ton status Premium Member

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    Call Edelbrock and see if this system will work.
    <A target="_blank" HREF=http://www.edelbrock.com/automotive/mpfi_sb.html>http://www.edelbrock.com/automotive/mpfi_sb.html</A>
    That would be my dream engine! (smog legal one anyway)
     
  5. CaptCrunch

    CaptCrunch 1/2 ton status

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    Well my plans if I go this route would be a 454 TBI unit and injectors w/ some porting work and a custom done chip to account for all the changes and relieve any problems that would result w/ the cam change.

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  6. ftn96

    ftn96 1/2 ton status

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    From what I understand all you have to do is get the chip burned and you would have to change the injector sizes. Like Capt. said, maybe using the 454's would work great.

    Will work for beer, parts and tools.
    90-350TBI-TCI700-241-33"-10/12 bolt w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  7. Blazer1970

    Blazer1970 1/2 ton status

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    Check with the guys at Howell Engine Development. They are the experts on GM fuel injection systems.
    <A target="_blank" HREF=http://www.howell-efi.com/>http://www.howell-efi.com/</A>

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  8. Brian 89KBlazer

    Brian 89KBlazer 1/2 ton status

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    Turbo City recommended only a high flow throttle body ($229 plus exchange) & an adjustable fuel pressure regulator ($49.95). Howell recommended the Holley 670 CFM throttle body, an adapter plate, & a chip. These prices may be a little outdated; it was a year ago or more that I did this research.
    I also talked to GMGoodwrench and the tech I talked to suggested try stock first, then only replace parts 1 at a time & see what happens. Seemed like a smarter approach then barrelling out & buying all kinds of parts, possibly for nothing.
    According to Delphi Automotive, the stock throttle body is rated to flow between 450-500CFM. If you've got a low RPM engine, then using the Vol. Efficiency, RPM, & CID; it's possible for the stock TBI to feed the 383!

    Just some food for thought.

    Brian
    89KBlazer
     

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