Spring Kt 66-E79 Bt .600 20-20450Racing Valve Spring KitDesigned for its specific application, taking into account several critical parameters including; cam profiles, harmonics, natural frequency of the springs, valvetrain mass, required pressure, wire stress, fatigue life, and engine rpm Progressively wound springs using Kobe super clean, chromium silicon(CrSi) based wire that is heat treated and shot peened Complete set for one engine Made in the USA Spring base fits 0. 565"
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