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Big block TBI

Discussion in 'The Garage' started by dirty willy, Oct 15, 2004.

  1. dirty willy

    dirty willy Registered Member

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    Can anyone tell me if the wiring from a small block TBI will inter change with a big block TBI /forums/images/graemlins/confused.gif
     
  2. azblazor

    azblazor 1/2 ton status Premium Member

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    It is essentially the same except for a couple of connectors and the length a a sensor wiring run or 2.
     
  3. fortcollinsram

    fortcollinsram 1/2 ton status

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    depends on what year the SBC is and what year the BBC are

    If the BBC came from a truck that had a PCM, then NO the wiring harnesses are quite different. My 1987 SBC harness was pretty close to that of the 1992 BBC harness when I swapped it in my truck. I used my old harness and just had to swap a few connectors on the throttle body, since the sensors on the TB of the BBC had the newer style sensors. The PCM harness has wiring for the tranny and stuff like that.
     
  4. fortcollinsram

    fortcollinsram 1/2 ton status

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    Oh, my BBC would've had a PCM but it was from a truck with a manual tranny so no PCM. I think 1991 or 1992 was the first year GM integrated PCM's to control the trannies
     

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