Skunk2 311-05-7350 Pro XP Valve Springs B16 - B17 - B18C - H22A* - F20B* Engines or VTEC Cylinder Heads Seat Pressure: 93 lbs at 1.320? - Open Pressure: 238 lbs at .820? - Coil Bind: .718? Must Use Skunk2 PN 312-05-0015 (Spring Bases) to Install B Pro Series XP Valve Springs in H22A/ F20B Engines