Upgrade your engine with the NEW 5.0L Vortec Cylinder Heads Pair, designed for 305 V8 engines from 1996 and newer. Manufactured from high-grade cast iron, these cylinder heads offer enhanced durability and reliability. They replace OEM part numbers #059 and #520, making them the perfect fit for Vortec engines. The thicker deck design ensures greater strength, while the improved thermal conductivity helps maintain optimal engine temperatures. As bare castings, these cylinder heads allow you to customize your valve train setup, giving you the flexibility to tailor your performance needs. Each head goes through a comprehensive 25-point quality check, ensuring it meets the highest standards of performance and reliability. Whether you're replacing worn-out parts or upgrading your engine for better performance, these cylinder heads are the perfect choice for any automotive enthusiast. 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.