SKUNK2 ALPHA VALVE SPRING AND TITANIUM RETAINER KIT HONDA D-SERIES SOHC VTECSkunk2 is proud to introduce its Alpha Valve Spring and Titanium Retainer Kit for Hondas D series VTEC engines. Each kit includes Skunk2s high quality valve springs and race proven titanium retainers that are the result of nearly two decades of racing and engine building experience. Manufactured exclusively from super clean, chrome silicone wire milled in Japan, Skunk2s Alpha Valve Springs for Hondas D series VTEC engines are a product of the companys