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I have for sale some GM 6.0 50lb/hr Flex fuel injectors. They come stock on the GEN 4 6.0 motors that run flex fuel, mainly the Savanna vans and a lot of the heavy duty trucks that were able to run flex fuel.
Rating is 50lb/hr at 4 BAR, so something like 42lb/hr at 3 bar if I remember right. Fully cleaned with brand new o-rings and everything.
I only used them for mock up I guess, installed them in the fuel rail to test fit them and needed to change to a different set of injectors based on my needs.
A gen 3 stock truck injector is taller than these, something like 5-8mm taller. You'd need little extenders and then likely have to slightly space up the fuel rail to make everything fit nice.
The injector connector clip style is also different than a GEN 3, so you'd need those harness adapters they also sell. Both of which are fairly cheap on ebay.