Description
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
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