Additional core charge of 3000.00 not included. Caterpillar 3126 Complete Drop-In Engine 64F8D210SB. Serial Number 8YL, 7AS, CKM, 9SZ. 3126, 3-Valve, 190-210HP, GMC Bus, Thomas Bus. Ordering Instructions: Provide Arrangement and Serial Number. Call us toll-free 1-800-282-9319 for ordering assistance and complete warranty information.