Supertech Performance Dual Valve Spring and Titanium Retainer Kit for the Subaru BRZ & Scion FR-S, FA20 Engine

Supertech Performance Dual Valve Spring and Titanium Retainer Kit for the Subaru BRZ & Scion FR-S, FA20 Engine SPRK-1002-BRZ - Supertech Dual Valve Springs - 74 lb Seat Pressure Kit Outer Spring - 29.05mm OD - 21.85mm ID Inner Spring - 20.50mm OD - 15.50mm ID 74 lb seat pressure @ 33.50mm 14.00mm Max Net Lift 19.50mm Coil Bind 10.00 lbs/mm Rate Complete set of 16 Dual Valve Springs, 16 Titanium Retainer's, and Seat's This Package Includes: Supertech Performance Dual Valve Springs # SPR-1002-BRZ, Supertech Retainer part # RET-H1000-BRZ, and Seat part # SEAT-H1002D-BRZ. Supertech Performance Dual Valve Springs are made with premium Super Clean Chrome Silicon Vanadium Steel alloy for higher performance and durability at high rpms and better memory. Computer designed to ensure that wire stress levels do not overpass the limits of stress defined in the diagrams of fatigue for long durability under extreme conditions. Computer software also allows us to make sure that the harmonics are well under control. Titanium Retainers are manufactured with high quality military certified Titanium alloy, CNC machined for tight that will ensure long term durability.