Upgrade your GM LS engine with the EngineQuest LS Cylinder Head #5364, 821, 823. This bare pair of aluminum cylinder heads is engineered to meet or exceed OEM specifications, ensuring a direct replacement for your LS3, L92, or L94 engine. With a chamber volume of 65CC and optimized port designs, these heads are perfect for enhancing airflow and maximizing performance. Constructed from high-grade aluminum, our cylinder heads are built to withstand the rigors of high-performance applications while resisting cracking and ensuring long-lasting durability. They feature a thicker deck for added strength and improved water flow design for enhanced thermal conductivity. This product is compatible with various GM models from 2001-2014, including the Escalade, Yukon, Silverado, and more. With a weight of 22 lbs per head, they provide a manageable option for any engine build or replacement. Whether you're rebuilding your engine or upgrading for improved performance, EngineQuest LS Cylinder Heads are your reliable choice for quality and performance. Don't settle for less — choose EngineQuest for your next engine project! 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.