Valve Spring Kit Build your BMW N54 Turbo stronger with Supertech valve spring kit. Key specs: Spring type: Conical Valve Spring, Seat pressure: 75lbs @ 36.50mm, Open pressure: 155lbs @ 10.00mm, Spring rate: 7.8lbs/mm, Max lift: 12mm, 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. Order direct from Supertech for fast shipping and expert technical support. Specs Retainer Qty: 12 ; 12 Kit Spring: spr-fe 20be Kit Spring Qty: 24 Safe Rpm Limit: 8000 Retainer: Steel Rate: 7.8lbs/mm Outer Spring Od: 24.40mm Outer Spring Id: 17.60mm Inner Spring Od: 21mm Inner Spring Id: 14.20mm Seat Pressure: 75lbs @ 36.50mm Open Pressure: 155lbs @ 10.00mm Max Lift: 12mm Coil Bind: 23.20mm Engines BMW N53 BMW N54 BMW N55 BMW S55 Manufacturer: Super Tech SKU: ST-SPRK-FE20N54-BE These images are representative, actual product images may differ.