The Ferrea Valve Spring Kit for BMW S63 engines is engineered for superior durability and performance under extreme conditions. This kit replaces BMW part numbers 11340039494, 11340054492, 11347578825, 11347572451, 11347504271, 11347614134, and 11340150843. Factory valve springs can struggle to meet the demands of high boost, aggressive cam profiles, and sustained high RPM, leading to valve float and potential engine failure. Ferrea valve springs are designed to prevent these issues by offering increased seat pressure and improved coil bind clearance, ensuring precise valve control at all RPM ranges. By stabilizing valve motion, these upgraded springs enhance airflow efficiency and overall cylinder head performance, allowing for higher rev limits and maximum power output. Whether you're building a high-performance street car or a dedicated race engine, Ferrea valve springs provide strength and consistency. Kit Contents: (32) High Performance Chrome Silicon Valve Springs (32) Precision-Fit Spring Seats (32) Titanium Spring Retainers Key Benefits: Optimized for BMW S63 Engines Superior Valve Control: Premium chrome-silicon steel valve springs maintain stability at high RPMs. Lightweight Titanium Retainers: Increase engine response while decreasing the risk of valve float. Precision Spring Seats: Designed for exact compatibility with S63 engines for optimal support. Ideal for High-Performance Applications: Perfect for racing, track use, and high-performance street setups. Spring Kit SpecificationsSeat Pressure: 90 lbsOpen Pressure: 170 lbsMax Net Lift: 11 mmCoil Bind: 24.85mmRate Inch: 201 lbsID: 16.82mmOD: 23.40mm BMW S63 Applications: BMW M5 Series 2011 - 2016 BMW F10 M52017 - 2023 BMW F90 M5 BMW M6 Series 2012 - 2018 BMW F12 M62012 - 2018 BMW F13 M6 BMW X5 M Series 2009-2013 BMW E70 X5 M2015-2018 BMW F85 X5 M2019-2023 BMW F95 X5 M BMW X6 M Series 2009-2014 BMW E71 X6 M2015-2018 BMW F86 X6 M2019-2023 BMW F96 X6 M BMW 8 Series 2018-2023 BMW G15 M850i2018-2023 BMW G16 M850i Gran Coupe BMW M8 Series 2019-2023 BMW F91 M8 Convertible2019-2023 BMW F92 M8 Coupe2019-2023 BMW F93 M8 Gran Coupe BMW ALPINA Series 2018-2023 BMW ALPINA B5 Bi-Turbo2016-2023 BMW ALPINA G12 B72020-2023 BMW ALPINA G07 XB7 Note: Installation requires the expertise of an engine builder.
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