{"product_id":"b58-pro-xtreme-valve-valve-spring-kit","title":"B58 Pro-Xtreme Valve \u0026 Valve Spring Kit","description":"\u003cp data-end=\"670\" data-start=\"327\"\u003eSimplify your next B58 engine build with this all-in-one Competition Valve \u0026amp; Spring Kit, now available from 5150 AutoSport. Featuring Ferrea's single groove stainless steel valves and a complete high-performance valve spring kit, this package eliminates the guesswork—giving engine builders a reliable, track-proven solution in a single click.\u003c\/p\u003e\n\u003cp data-end=\"712\" data-start=\"672\"\u003e\u003cstrong data-end=\"712\" data-start=\"672\"\u003eBuilt for Power. Engineered for RPM.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1123\" data-start=\"714\"\u003eThis kit includes standard-size Ferrea Competition Plus intake and exhaust valves (\u003cstrong\u003e30.1mm intake \/ 28.5mm exhaust\u003c\/strong\u003e) made from aerospace-grade EV8-Z18 material. These single groove valves are ideal for high-lift camshafts and sustained high-RPM use. Ferrea’s two-step slow forging and 48-hour heat treatment process ensures exceptional strength, heat resistance, and fatigue life—even under extreme boost or racing conditions.\u003c\/p\u003e\n\u003cp data-start=\"116\" data-end=\"191\"\u003e\u003cstrong data-start=\"116\" data-end=\"191\"\u003eIncludes Valve Spring Locators – A Critical Upgrade Many Kits Leave Out\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"193\" data-end=\"777\"\u003eValve spring locators are essential for high-performance valvetrain stability. Locators keep the springs precisely centered on the cylinder head, preventing unwanted movement that can lead to harmonics, instability, or even failure at high RPM. By stabilizing the spring base, the locator helps maintain correct spring frequency and seat pressure, extending the life of both the spring and the cylinder head. \u003c\/p\u003e\n\u003cp data-end=\"1149\" data-start=\"1125\"\u003e\u003cstrong data-end=\"1149\" data-start=\"1125\"\u003eIncluded Components:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"1189\" data-start=\"1153\"\u003e\n\u003cstrong data-end=\"1187\" data-start=\"1153\"\u003e24 Ferrea Single Groove Valves\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli data-end=\"1226\" data-start=\"1194\"\u003e30.1mm intake \/ 28.5mm exhaust\u003c\/li\u003e\n\u003cli data-end=\"1267\" data-start=\"1231\"\u003eAvionics-grade chrome-plated stems\u003c\/li\u003e\n\u003cli data-end=\"1312\" data-start=\"1272\"\u003eHardened tips for increased durability\u003c\/li\u003e\n\u003cli data-end=\"1368\" data-start=\"1317\"\u003eEV8-Z18 stainless for high temperature resistance\u003c\/li\u003e\n\u003cli data-end=\"1368\" data-start=\"1317\"\u003eSingle Groove Valve Locks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1401\" data-start=\"1372\"\u003e\n\u003cstrong data-end=\"1399\" data-start=\"1372\"\u003eFerrea Valve Spring Kit\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli data-end=\"1453\" data-start=\"1406\"\u003e24 premium chrome-silicon steel valve springs\u003c\/li\u003e\n\u003cli data-end=\"1493\" data-start=\"1458\"\u003e24 lightweight titanium retainers\u003c\/li\u003e\n\u003cli data-end=\"1535\" data-start=\"1498\"\u003e24 precision-fit valve spring seats\u003c\/li\u003e\n\u003cli data-end=\"1535\" data-start=\"1498\"\u003eValve Locators\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1855\" data-start=\"1537\"\u003eFerrea’s spring system is engineered to maintain valve control at high RPM, prevent float, and handle the increased load of aggressive cams and high boost. Lightweight titanium retainers reduce valvetrain mass and improve engine response, while the included spring seats ensure long-term reliability under high stress.\u003c\/p\u003e\n\u003cp data-end=\"2171\" data-start=\"1857\"\u003e\u003cstrong data-end=\"1881\" data-start=\"1857\"\u003eWhy Choose This Kit:\u003c\/strong\u003e\u003cbr data-end=\"1884\" data-start=\"1881\"\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"2171\" data-start=\"1857\"\u003eOne-click solution: No need to piece together components\u003c\/li\u003e\n\u003cli data-end=\"2171\" data-start=\"1857\"\u003eIdeal for high-RPM, high-lift camshaft builds\u003c\/li\u003e\n\u003cli data-end=\"2171\" data-start=\"1857\"\u003eSupports boosted, track, and motorsport applications\u003c\/li\u003e\n\u003cli data-end=\"2171\" data-start=\"1857\"\u003eDesigned specifically for the BMW B58 engine\u003c\/li\u003e\n\u003cli data-end=\"2171\" data-start=\"1857\"\u003eTrusted Ferrea quality backed by decades of motorsports experience\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2349\" data-start=\"2173\"\u003eRecommended for professional builds, high-performance street use, or full-race applications.\u003c\/p\u003e\n\u003cp data-end=\"2502\" data-start=\"2351\"\u003e\u003cstrong data-end=\"2373\" data-start=\"2351\"\u003eInstallation Note:\u003c\/strong\u003e\u003cbr data-end=\"2376\" data-start=\"2373\"\u003eProfessional installation by a qualified engine builder is strongly recommended to ensure optimal performance and reliability.\u003c\/p\u003e","brand":"Ferrea","offers":[{"title":"Default Title","offer_id":53077172027699,"sku":"5150-HPVK+HPVSK-B58","price":2499.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0735\/3827\/3587\/files\/bmw-s58-valve-and-spring-kit.webp?v=1748902076","url":"https:\/\/5150autosport.com\/products\/b58-pro-xtreme-valve-valve-spring-kit","provider":"5150 AutoSport","version":"1.0","type":"link"}