Supertech valve spring kit for Nissan SR20 VE P12 DOHC applications are designed for racing reliability and high-RPM use. Key specs: Spring type: Dual Valve Spring, Seat pressure: 83lbs @ 37.50mm, Open pressure: 180lbs @ 10.00mm, Spring rate: 9.40lbs/mm, Max lift: 17.40mm, and Safe RPM: 8000. Each kit is matched as a complete valvetrain package — springs, retainers, locators and locks — so installation is straightforward and clearance issues are eliminated. Built to control valve motion at high RPM, reduce valve float and support aggressive cam profiles. Compatible with most aftermarket and OEM camshafts within the rated lift range. Installation requires verifying installed spring height with the included shims and confirming retainer-to-seal clearance. Recommended for any build running aggressive cams, increased RPM ceilings, or forced induction. Backed by Supertech's reputation for valve spring engineering and racing reliability. Specs Retainer Qty 16 Seat Locator use oem seat Seat Locator Qty 16 Kit Spring spr-2035-2022 Kit Spring Qty 16 Safe Rpm Limit 8000 Retainer Titanium Rate 9.40lbs/mm Coil Bind 17.40mm ; 19mm Outer Spring Od 30mm Outer Spring Id 21.80mm Inner Spring Od 20.50mm Inner Spring Id 15.50mm Seat Pressure 83lbs @ 37.50mm Open Pressure 180lbs @ 10.00mm Max Lift 17.40mm Engines Nissan SR20 VE P12 DOHC These images are representative, actual product images may differ.