This cylinder head is a brand-new, fully assembled replacement designed for 4.0L V6 OHV engines from 1998 to 2000. Manufactured from high-grade cast iron, it features 100% new valves, seals, springs, retainers, and keepers for superior durability and performance. Ideal for replacing cracked or worn-out heads, this unit is engineered for improved flow, increased strength, and better thermal conductivity. Precision CNC machining ensures a perfect fit and optimal function. A complete stock replacement solution for pickup trucks and SUVs, this assembled cylinder head offers premium quality at an exceptional value. 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.