8N1188 Fits Caterpillar Fits CAT Cylinder Head D330C D333C D3304DI D3304PC D3306One New Aftermarket Replacement Cylinder Head Fits Caterpillar (Fits CAT) 3304 and 3306 Series Engines This aftermarket replacement cylinder head replaces OEM part number 8N1188 and is designed for the Fits Caterpillar 3304 and 3306 series inline 4 cylinder diesel engines. The cylinder head houses the intake and exhaust valves and provides the combustion chamber seal critical to engine performance. Available bare or loaded with valves depending on the