4.3 to 350 tbi

[Bcrook5]

hey I’m thinking of swapping my 4.3 to a 350 just for ease I would like to find a 350 tbi would it be a fairly straight forward swap could I just reprogram my computer or would I need to get a whole new one? Any other things I know motors mounts etc but anything else I should look into?

 

[PlayingWithTBI]

What year truck? They all have the same Throttle Body with different size injectors. You'll need to get the right BCC and burn your chip for the 350 unless you can get its ECM (or at least its chip).

http://www.gearhead-efi.com/BCCFind/

 

[Bcrook5]

What year truck? They all have the same Throttle Body with different size injectors. You'll need to get the right BCC and burn your chip for the 350 unless you can get its ECM (or at least its chip).

http://www.gearhead-efi.com/BCCFind/

My truck is a 1993 4x4 with an nv3500

 

[PlayingWithTBI]

Here's another alphabetized lookup.

http://www.scotthansen.net/BCCLookup.pdf

 

[L31MaxExpress]

My truck is a 1993 4x4 with an nv3500

That setup is not a plug and play compatibility with any stock GM computer. The 93-95 4.3 sticks used a 8192 baud rate PCM and the 93-95 350 stick trucks used a 160 baud rate ECM. The pinouts and connectors are different between them. Because they are different computers you cannot just swap the chip either. The PCM uses a memcal and the ECM a chip. The 96-97 Mexico TBI export trucks use the PCM but I have yet to see a binary file for anything except an automatic.

I would talk with Dave at Old School EFI on the Gearhead-EFI forum. I think he has done a V8/Stick PCM calibration before. Those PCMs have alot of options when it comes to what they can run. TBI/CPI/MFI along with 4L60E, 4L80E, 700r4, Non computerized automatics and Stick. Years ago I did a 454 MPFI/4L60E setup for a local guy with a 95 C1500.

 

[Supercharged111]

What's the diff between a memcal and a chip?