Spring Kit Steel Yxz1000R 80-81700Lightweight Racing Valve Spring KitCompatible with boosted or turbocharged applications Designed with increased spring rates and high lift compatibility compared to the stock springs CNC machined titanium or H. T. (Heat Treated) Steel retainers and Cr Si (Chromium Silicon) alloy dual springs provide valvetrain control at high rpms with high performance camshaft capability Made in the USA Recommend using shortened valve guides to achieve higher than
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