Skunk2 Pro Series Valve Spring Set for the Honda S2000 F-Series Engines  E-mail this product to a friend previous | up | next  Order now for Free Shipping! Skunk2 Pro-Series valve springs aimed to be the best valve springs in the sport compact market. Pro-Series valve springs are designed to handle the demands of extreme lift camshafts running at the prolonged high RPMs of professional championship level racing. Skunk2 has tested the Pro-Series valves springs up to 11,000 rpm. The Japanese milled, super clean chrome silicone wire is 100% eddy-current inspected before coiling. After the spring is coiled, it is heat treated, shot-peened, and further enhanced with an advanced proprietary chemical polishing and nitride-ing process. The end result is a lightweight valve spring that will safely accommodate high lifts and has superior resistance to load loss even under extreme operating conditions. This type of performance is only possible because of the additional processing and stress relieving that goes into Pro-Series valve springs allowing us to use less coils. The Skunk2 Pro-Series valve spring is the only valve spring designed for use with Skunk2 Pro-Series camshafts. Skunk2 Part # 311-05-5380 SKU: 311-05-5380 Dimensions: 6x6x6 Weight: 2.00 Regular Price: $368.40  On Sale For: $316.99  Quantity: