74lbs injectors to 90lbs injectors which prom?

[Deadman walking]

So I'm changing out my 74lbs 454 injectors for 90lbs injectors. anyone have a parts number or a link for a good prom replacement for the 90lbs injectors? Couldn't find anything on the net.

 

[PlayingWithTBI]

anyone have a parts number or a link for a good prom replacement for the 90lbs injectors?

You need to get yours, or another chip, burned with the corresponding BPC (Base Pulse Constant) for the bigger injectors at whatever fuel pressure you're running. There are folks around that can do that here, and on GearHead-EFI like Dave w (OldSchool EFI). As an example, your 74lb injectors BPC @ 13PSI is 112 where, 90lb ones are 92. Then fine tune it with data logging and adjusting your VE BPC tables. YMMV

 

[Deadman walking]

Ah I figured it would be a PITA. I was wanting to do the 4 barrel TBI it's just too much with those thanks anyways.

 

[tayto]

GM never made a 90# TBI injector