Mack 13GC316 Intake Valve Seat PAI 2558-STD (Pack6)CROSS REFERENCE: 20706194 13GC38 4103 5200545772 20706566 13GC318 13GC316 5200545772 APPLICATION: Mack E7 Aset E tech Multiple Use Application. BRAND: PAI 2558 STD Mack 13GC316 Intake Valve Seat PAI 2558 STD. Truck repair parts and heavy truck parts. Supports valve alignment and helps regulate air intake for stable engine performance. All components are proudly manufactured in the U. S. A. by PAI Industries Inc., an ISO9001 certified company with over