Mack 454GC5247 Camshaft PAI 891920OEMCROSS REFERENCE: 454GC4271 454GC5247 25131556 APPLICATION: Mack Aset Multiple Use Application. DETAILS: Genuine Part BRAND: PAI 891920OEM Mack 454GC5247 Camshaft PAI 891920OEM. Heavy duty truck parts and diesel truck parts. Supports precise valve timing and maintains reliable camshaft operation. 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