Mack 891GC42M Valve Yoke PAI 3522CROSS REFERENCE: 20706475 891GC42M 891GC216M 4103 5200267193 APPLICATION: Mack E7 E Tech Aset Multiple Use Application. BRAND: PAI 3522 Mack 891GC42M Valve Yoke PAI 3522. Diesel parts and heavy duty truck parts. Maintains precise valve positioning and supports consistent valvetrain stability. All components are proudly manufactured in the U. S. A. by PAI Industries Inc., an ISO9001 certified company with over 50 years of experience in the heavy duty