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Thread: TBI (from the early Grunge age) Camshaft Options and God Knows What Else!

  1. #1
    Fuel Injected! pma4x4's Avatar
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    Apache Junction, Arizona
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    TBI (from the early Grunge age) Camshaft Options and God Knows What Else!

    Google-Foo is weak today. Didnt have anything like this pop up in search.

    I have plans for a motor upgrade but this is about two years down the road after we get settled back in Minnesota. so for right now I am looking for a "budget" option to gain a bit more top end out of my TBI. (Specs below)

    Im into the throttle just enough at highway speed that it rarely wants to stay in lock up. If I use 3rd gear I swear Im not seeing ti go into lockup (refresher, can a 700r4 go into L/O in 3rd?)

    Is there any mild cam I can put in my TBI 350 without freaking the PCM out? If I can help it I really dont want to have to go thru repinning, custom swapping and fun times on a laptop but will if I have to. I was thinking somewhere in the range of the like the Edelbrock #3702 cam Dur@50 194 int./214 exh. Adv Dur. 244 int./264 exh. lift0.398 int./0.442 exh. LS of 112.

    Specs
    1991 Chevy Suburban V1500 4wd 112,xxx original miles
    350 TBI with 51K on GM replacement motor.
    Bored out TBI with matched injectors
    injector tower spacer
    14lb fuel PSI verified with gauge
    Stock exhaust manifolds
    3" exhaust
    High flow Magnaflow cat 2.5
    Flow master series 70 Muffler
    700r4
    Stock air cleaner
    stock ignition
    recent repair AC Delco EP386 Fuel pump

    4" lift
    4.56 gears
    315/75-16 ATs
    200lbs on nose for bumper and winch
    roof rack (drag)

    The bored TBI, fuel psi spring and injectors did do a bit I was pretty impressed with that. Im just trying to find something that can give it a bit more power at highway speeds. Im just wondering if I can get away with any cam upgrade before the PCM flips out and doesn't now how to adjust. its almost futile but i need something to last about a year or two until I can finish the motor swap project.

    I know the heads bite the big one. aside from cam. what about open air cleaner or intake?

    Thank you for your time!



    Current: '91 1500 Suburban (3rd owner), 350 TBI, 700R4

    TBI system: RV Morse Bored TB - Matched FIs - Adjust. fuel psi regulator - Injector pod spacer - RV Morse Powerplate - Hypertech "salad bowl"

    Full write-up here

    Follow the build here



  2. #2
    Super Moderator dave w's Avatar
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    6,268
    Stock chips work great with stock engines.

    Modified engines DO NOT work great with stock chips.

    " fun times on a laptop " is likely best option for a modified engine.

    dave w

  3. #3
    Fuel Injected!
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    Oct 2013
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    I don't think a cam similar enough to the stock one to still work well with the stock ECM programming would make enough difference to be worthwhile.

  4. #4
    Fuel Injected! pma4x4's Avatar
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    Jun 2014
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    Yeah this was a short lived idea that quickly got tossed in the trash. going with original plan.



    Current: '91 1500 Suburban (3rd owner), 350 TBI, 700R4

    TBI system: RV Morse Bored TB - Matched FIs - Adjust. fuel psi regulator - Injector pod spacer - RV Morse Powerplate - Hypertech "salad bowl"

    Full write-up here

    Follow the build here



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