dirty willy
Registered Member
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
CK5
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Big block TBI
- Thread starter dirty willy
- Start date
It is essentially the same except for a couple of connectors and the length a a sensor wiring run or 2.
fortcollinsram
1/2 ton status
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.
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.
fortcollinsram
1/2 ton status
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
