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Thread: tbi injectors

  1. #1

    Default tbi injectors

    im wanting to put the bigger 454 injectors on my 350 my question is if the injector pods are the same size. what i mean is if i can pull the injectors out of the 454 pods and put them in the 350 pods my reason is that the fuel inlet on the 454 pods is broken. any info will help guy thanks.

  2. #2
    Sr. Engineer
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    Aug 2009
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    Virginia Beach, VA.
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    Default

    If you do the swap, you may have to change the fuel pump, so you get more pressure.

  3. #3

    Default

    yeah i was told that a adjustable fuel pressure regulator will take care of the pressure difference i just need to know if the pods are the same

  4. #4
    Sr. Engineer
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    Default

    Sorry I don't know the answer to that. :(

  5. #5

    Default

    thats alright thanks. i have talked to a bunch of different people and noone seems to know the answer

  6. #6
    Sr. Engineer
    Join Date
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    Default

    See if murdog replies...
    He usually has a good handle on these things.

  7. #7

    Default

    Try TurboCity.com, they do alot of TBI mods.

  8. #8

    Default

    GM used 3 TBI housings, the 454 got a larger bore than the 4.3 & small block V-8's and the 2.8, 3.2 & 3.4 v-6 was the smallest.

    The 4.3 injectors did fit into the smallest TBI housing when I put the 3.4L crate engine in my S-10. The only difference was the flow rate...

    I remember that the TBI ECM could handle up to a 10% increase in displacement and going from a 2.8 to a 3.4 was more like 20% so I went to the 4.3L injector to fool the 2/8L ECM...

    The injectors are the same size. The small block TBI housing is not the same throttle bore size as the big block. I would be concerned over the higher flow rate if you have not modified your engine's ability to breath better you will be running too rich.
    Still Loyal to GM after all these years...:shocked:
    2006 Impala LT 3.5L
    2005 Silverado WT small cab/longbed 4x4 4.3L V6
    1999 Grand Am 3.4L in TX w/ our youngest
    1993 GMC Jimmy 4.3L 4 door 4x4 'Ole Rusty' - 'SOLD'
    1988 S-10 small cab/longbed HT3.4L Crate Engine
    1970 Nova 250 I-6, factory 3 sp floor shifter.
    1968 Chevelle 'Nomad' Wagon 250 I-6 w/ 3 on da' tree.

  9. #9

    Default

    thanks for the info wis bang. i have dramatically increased the flow of my engine i have put cold air intake eddlebrock performer intake manafold cam full length headers and true dual 2.25 inch exhaust. im going to pull the injectors out this weekend and install the big block injectors and see what i end up with that is if summit sends me my fuel pressure regulator tomorrow.

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