Upgrade your FE Big Block V8 engine with this Adjustable Rocker Arm Shaft Assembly, built for precision and durability. Designed to fit 352, 360, 390, 410, 427, and 428 engines, this assembly ensures optimal valve train alignment and smooth operation. Manufactured with high-strength Chromium-Molybdenum alloy steel, this rocker arm shaft assembly delivers exceptional durability and performance, making it perfect for restoration projects or performance upgrades. Its direct replacement design ensures easy installation, saving you time and effort. Enhance the reliability and performance of your engine with this heavy-duty rocker arm shaft assembly, built to withstand the demands of high-performance applications. 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.