Maximize the Performance and Reliability of Your 2004.5–2005 GM 6.6L LLY Duramax Diesel with Premium Cylinder Heads & Gasket Kits, engineered for long-lasting power, reliability, and performance. Whether you're behind the wheel of a Chevy Silverado 2500HD/3500HD or a GMC Sierra 2500HD/3500HD, these cylinder heads and gasket kits are built to handle heavy towing, high-performance upgrades, and demanding workloads. The LLY Duramax is known for its torque-rich diesel power, but maintaining that performance under pressure requires top-of-the-line head gaskets and stud kits. That’s why we offer trusted brands like Fleece Performance, Sinister Diesel, and Alliant Power, who deliver everything from complete cylinder heads to precision-engineered head stud kits. Designed to prevent head lift, enhance sealing under boost, and keep your engine cool and efficient, these parts are ideal for both full top-end rebuilds and performance upgrades. Give your Duramax Diesel the durability, fitment, and strength it deserves. Built to last, built to perform.
