GMC TBI Fuel Injector Identification

[DJK555]

My 1988 GMC K2500 originally came with a 5.0L which was changed to a 5.7L by the previous owner. I understand that there is a difference in fuel injectors between these engines. Can anyone help with identifying the injectors that are in the throttle body now and with what I should be looking for if they are the srong ones. I am assuming that the throttle body is the same but came with different injectors.

Thanks in advance.

David​

 

[Zembonez]

GM TBI injectors, color codes, and flow rates

You should have:

Green/White 5.0L 40 lb/hr GM 5235279

You want:

Orange/Black 5.7L pickup 55 lb/hr GM 5235206

Might also look at:

http://www.jegs.com/p/Venom/Venom-Super-Flow-GM-TBI-Fuel-Injectors/763022/10002/-1

 

[PenguinLTZ]

 

[DJK555]

Thanks Zembonez. Just what I was looking for. I assume that the throttle bodies are basically the same?

 

[DJK555]

Now that I know that this truck is running 5.0L injectors on a 5.7L should I replace them considering the cost - about $300 with gasket set. The truck is used for property maintenance and wood hauling in addition to hauling a camper. Would the increase in performance justify the cost? Your comments?

 

[Zembonez]

If it runs well I'd leave it alone. If you just have to change it, I would probably look for a boneyard TBI unit and swap it before I spent that on it. They were quite reliable.