Housing Set, Fuel Injector LH & RH, 2nd Design for 1991 & 1992 ZR-1 LT5.  This set of injector housing has been painted in the "Black Widow" style.  One of the housings has been nicely ported, the other has not been modified or ported at all.  Looks like a Mercury Marine in-house project that was never completed.  Great deal for the individual planning to port as et for his engine....half the work is already done! 

NOTE: This is a NEW, GM OEM part. 2nd Design which DOES NOT have the "washers" in the crankcase ventilation ports to the PCV system.