Can I use injectors from an 85 V6 firebird in my 87 firebird? When I pulled out the injectors from the junkyard car, I found two were different. The numbers on top are D167 and 5235136. Are these ok to use as well? Here's pic.

 

They should be compatible. Coil impedance is the same, and flow rates should be the same or close enough to operate correctly. As long as they are not dirty or leaking internally, it should work.

 

Right.... in different years, they used different suppliers or versions of them, that are more or less equivalent functionally....

For best results, send them to www.cruzinperformance.com and get Rich to clean and flow-match them.