Engineered for high-performance applications, this Feuling Precision Valvetrain Component utilizes premium stress-relieved conical ovate wire featuring nitrided surface heat treatment, shot-peened enhancements, and Nano Peen™ polish. The design incorporates a smaller, lighter-weight retainer to reduce overall valve mass, facilitating quicker rev response and smoother motion. Constructed to withstand the demands of high-lift, steep-ramped camshafts, the system offers an extremely high level of fatigue life and is dyno proven and track tested. The kit includes High-Load BeeHive® valve springs, lightweight 10° Titanium retainers manufactured from Ti-17 alloy and micropolished for enhanced durability, machined heat-treated chromoly spring seats, seat shims, valve locks, and premium Viton® valve seals equipped with a spring-loaded valve stem wiper system.
This direct replacement kit requires no machining or rocker box clearance, supporting up to 0.574" lift for '84-'04 Big Twin and '86-'03 XL models, and up to 0.700" lift for '05-'17 Twin Cam engines. For larger camshafts, valve guide machining is necessary to ensure proper seal-to-retainer clearance. The valve springs must be installed at the correct open height, matching maximum lift to the specified open height, with seat pressures ranging from 170 lb at 1.935" installed height (0.720" lift) to 217 lb at 1.789" (0.574" lift), and a coil bind height of 1.125". Manufactured in the USA, this component set is designed to handle the highest demands of performance engines while maintaining precise operational parameters.