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Changing 350TBI to TPI from 305

816 views 1 reply 2 participants last post by  RippinRon 
#1 ·
I have an '88 IROC-Z with the LB9 (305TPI)/700R4 and a spare '90 350TBI. What is required to put the 350 in the car and using the TPI parts? I read a lot of info and the closest I got was 305TPI to 350TPI on Z28 forum.

http://www.z28.com/forum/showthread.php?t=59219

It identifies the differences, but not sure what I need to do to complete the swap. Thank you in advance for your input.
 
#2 · (Edited)
You will need

- 350 knock sensor and esc module
- High pressure fuel pump
- 350 prom
- The injectors for the 305 and 350 were the same, the difference is the fuel pressure regulator, so an aftermarket one is a good idea.
- fuel lines will need reworked
- throttle cable and t.v cable (depending on the tranny)
- Possibly a vehicle speed sensor (depending on the tranny)

Here is a good read.
 
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