OEM Replacement Valve Spring Kit

Valve Spring Kit - 0.415 Lift - Knucklehead '36-'47

• Designed to give stock pressures and work with stock cam profiles
• Retainers, keepers, and bases are modeled using FEA (Finite Element Analysis) to maximize mechanical strength
• Springs are wound from Super Clean chrome silicon valve spring wire that has been heat treated and shot peened
• Manufactured to original O.E.M. specifications using premium modern materials, design protocols and manufacturing techniques
• Made in the USA