This cylinder head is a brand-new, fully assembled replacement for 4.0L OHV engines from 1991 to 2007. Crafted from high-grade cast iron, it features a thicker and stronger design than the original factory heads, ensuring improved durability and performance. Equipped with 100% new valves, springs, seals, retainers, and keepers, this head is precision CNC-machined for a superior fit and function. It also includes a temperature sensor port at the rear (driver's side), offering installation flexibility. Perfect for pickup trucks and SUVs, this replacement head is engineered for better airflow, increased strength, and resistance to cracking. Engine Quest produces high-quality OE-style replacement parts. Each part undergoes rigorous testing and inspections to meet EngineQuest's exact specifications. Designed for precision manufacturing and durability, our products ensure easy installation. With nearly 500 SKUs available, the company specializes in hard-to-find, in-demand parts, including those no longer available from the OEM, difficult to salvage, or with prohibitively high OEM costs.