; HomeHeavy Duty Truck PartsEngines & Engine PartsEngine AssysCaterpillarOtherCore 1997 CAT C12 (40 PIN) 1YN 9NS Engine Assy Core 1997 CAT C12 (40 PIN) 1YN 9NS Engine Assy Unfortunately this part is temporarily unavailable. View other Caterpillar Other Engine Assys