Manley Chevy LS Valve Spring and Tool Steel Retainer Kit (w/ Valve Locks)

If you're building a high-performance Chevy LS or LT engine, getting the valvetrain right is crucial, especially when you're pushing the limits with higher-lift camshafts. This Manley Performance valve spring kit is designed to give you a complete, well-built solution, so you don't have to worry about mixing and matching components. It's engineered to handle the demands of racing and high-RPM operation, ensuring your valves stay under control when you need it most.

The NexTek? valve springs in this kit are made from a clean, high-tensile chrome silicon steel that's shot-peened to military specifications. This process significantly improves fatigue life, meaning they'll hold up better over time and under stress. The included tool steel retainers are a notable step up; they're heat-treated to a hardness of Rc 56 and are only a few grams heavier than titanium versions, offering a strong and durable option. You also get CNC-machined I.D. spring locators with a black oxide finish, machined valve locks made from a high-quality steel alloy, and Viton? valve stem seals that resist heat, chemicals, and oil exceptionally well. This kit is designed for a maximum lift of 0.660 inches, and the components are made to fit an 8mm valve stem.

This kit is a comprehensive package, including the springs, retainers, locators, valve locks, and seals, taking the guesswork out of sourcing individual parts for your build. While the maximum lift figures are generally reliable, keep in mind that the exact lift capability can vary slightly depending on your specific cylinder head setup and installed height. This kit is a solid option for anyone serious about getting their LS or LT engine's valvetrain ready for serious performance.