Cummins 3903797 Cylinder Block PAI 060020CROSS REFERENCE: 3903797 3916255 APPLICATION: Cummins 6B Multiple Use Application. BRAND: PAI 060020 Cummins 3903797 Cylinder Block PAI 060020. Aftermarket truck parts and truck repair parts. Ensures structural rigidity and stabilizes combustion chamber 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 duty truck parts industry. This