Can anyone ID these injectors for me? lbs, manufacturer?
I know that's a uscar/ev6 style connection.

 

+1 lbs at what fuel pressure??

 

Are there any other numbers on it?

The numbers you show don't lead to anything fruitful.

When I was doing a similar brand/model search on my vette injectors, there was another set of numbers on the "fuel rail clip" bosses, and that was the actual model number.

Both 5158A and R4B have uses in chemistry and medicine, so searches based on them and "injector" suck lol

 

I called SLP about that and the guy I talked to said they are rated at 60psi.

 

They were manufactured May 15, 2008. The 28158835 is the identification number. You can find the lb/hr from that.