Skunk2 Tuner Series Honda/Acura (H22A/F20B) DOHC VTEC Alpha Valve Spring Set (Dual Springs)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 years of racing and engine building experiences. Alpha Valve Springs are able to prevent valve float and maintain valvetrain stability at engine speeds in excess of 10,000 rpm. Skunk2 designs, develops, and tests its entire valvetrain lineup in house to ensure superior quality and