Caterpillar 7C3864 Camshaft PAI 391903ECROSS REFERENCE: 1N4407 5S3972 7C3863 7E9980 8N3981 229 1831 7C3864 APPLICATION: Caterpillar 3300 3306 Multiple Use Application. BRAND: PAI 391903E Caterpillar 7C3864 Camshaft PAI 391903E. Aftermarket truck parts and truck repair parts. Supports precise valve movement and consistent engine function. 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