Kelford Valve Spring and TI Retainer Set for 2002-2014 Subaru WRX, and 2004-2020 Subaru WRX STI

Nano-peen and gold nitride surface finishing treatments for superior endurance. High frequency, increased seat pressure, low open pressure. Designed specifically for the Subaru flat four. 95lb seat pressure at 35.50mm (1.397") installed height. Coil bind is at 23.00mm. 12.00mm maximum lift.