Supertech Performance Single Valve Spring and Titanium Retainer Kit Fits Nissan Skyline RB20, RB20DET Engines - 70lb. SPRK-2081/RB20 - Supertech Single Valve Springs - 70 lb Seat Pressure. Spring - 27.50mm OD - 20.00mm ID. 12.10mm Max Net Lift. Will Fit Nissan Skyline RB20, RB20DET Engines with Hydraulic Lifters. Complete set of 24 Single Valve Springs, 24 Titanium Retainer's, and Seat's. This Package Includes: Supertech Performance Single Valve Springs # SPR-2081/RB20, Supertech Retainer part # RET-NVG1015/T1, and Seat part # SS-2820-2.2. Supertech Performance Dual Valve Springs ...