Additional core charge of 1500.00 not included. Caterpillar 3126 Long Block Engine 64G1L072SB. Serial Number 8YL, 7AS, CKM, 9SZ. 3126 Series, 170-300HP, Various Arrangement/Serial Number combinations.. Ordering Instructions: Provide Arrangement and Serial Number. Call us toll-free 1-800-282-9319 for ordering assistance and complete warranty information.