Kibblewhite Precision 20-20450 Complete Valve Spring Kit - .600in. Lift

Designed for maximum performance. Feature interference-wound, double-chrome silicone springs; heat-treated steel base washers. Available in a complete set for one engine. Include steel retainers. Made in the USA. Require machining of valve guides for special seals. NOTE: May require R-Style valves to achieve correct install height Spring kits use stock lower collars (KPMI offers replacement lower collars - Part # 20-2111). Type: Intake/Exhaust. Retainer Material: h. t. Steel. Valve Lift: 0.600in. Installed Height: 1.510in. Seat Pressure: 150#. Open Pressure: 385#. @ Lift: 0.600in. Note: The basewasher is counterbored to fit a 0.665in. outside diameter seal.