Engine core does not turn 360 degrees, 2000 MACK E7 ENGINE ASSEMBLY, Family Number: YMKXH11.9H56 Displacement: 11.9L Horsepower: 310 CPL: N/A ESN: OM3636 ECS: SPL For more information about this item, give us a call. We ship worldwide! ( CRG HEAVY TRUCK PARTS ) 929 W PULASKI HWY ELKTON, MD 21921