The OTR 38" Cylinder Head is designed to provide superior performance and reliability. This cylinder head is constructed from high grade aluminum alloy and features a reinforced rib design to help prevent cracking in vulnerable areas. It is precision machined to ensure a perfect fit and all threaded holes are re-threaded for easy installation. This cylinder head is designed to provide greater power output and improved fuel efficiency, while also allowing the engine to warm up more quickly and requiring a smaller radiator. FleetPride is your First Click in Heavy Duty®.