New Old Stock (NOS) AC Delco Exhaust Gas Recirculation (EGR) Valve, Part Number 12325227 (also referred to as 12325227). This mechanical valve replaces GM OEM P/N 17050315 and is suitable for numerous Buick, Chevrolet, Oldsmobile, and Pontiac models with 4.1L (250cid) L6 engines from 1973 through 1979. Used to reduce NOx emissions.
| Make | Model | Years Consolidated | Engine Size | Special Notes | Part Number | OEM Numbers |
| BUICK | Apollo, Centurion, Skylark, Regal | 1973-1979 | 4.1L L6 (250cid) | Mechanical Valve. L6 engines only. Check casting number. | 12325227 | 17050188, 17050305, 17050315 |
| CHEVROLET | Passenger Cars & Trucks (Camaro, Chevelle, Nova, C/K Trucks) | 1973-1979 | 4.1L L6 (250cid) | Mechanical Valve. L6 engines only. Check casting number. | 12325227 | 17050188, 17050305, 17050315 |
| OLDSMOBILE | Omega, Cutlass | 1973-1979 | 4.1L L6 (250cid) | Mechanical Valve. L6 engines only. Check casting number. | 12325227 | 17050188, 17050305, 17050315 |
| PONTIAC | LeMans, Grand Prix, Ventura | 1973-1979 | 4.1L L6 (250cid) | Mechanical Valve. L6 engines only. Check casting number. | 12325227 | 17050188, 17050305, 17050315 |