The next generation of valve spring technology ... available today! Far superior to H-11 springs. Superior materials, heat treatment, designs, manufacturing processes, inspection and quality are what separates the NexTek series apart from the rest. Manley eclipses the 1,000 lbs. barrier. Ideally suited for Competition, Super Stock, Super Classes, Pro Stock, Mountain Motor, Fuel and Alcohol classes applications. Better valve train stability and component life. More runs for your dollar.