{"product_id":"platinum-660-dual-spring-kit","title":"Platinum .660\" Dual Spring Kit","description":"The Brian Tooley Racing Platinum .660\" Dual Spring Kit is a trusted upgrade for GM LS engines, especially when paired with aftermarket camshafts. It's engineered as a direct fit for LS engines utilizing stock rocker arms, offering superior valve control, stability, and durability, even at higher RPMs and increased lift.\n\nThis comprehensive kit includes 16 polished dual springs (SP001-1), 32 locks (VL7°8MM-1), 16 titanium retainers (SR001-1), 16 locators for stock or bronze guides, and 16 valve seals (VS LS). The dual spring design enhances open pressure and resists valve float, while the lightweight titanium retainers minimize valvetrain mass for quicker response and improved longevity.\n\nThe spring specifications are as follows: 155 lbs of seat pressure at 1.780\", 380 lbs of open pressure at 1.180\", 400 lbs of maximum open load at 1.130\", and a coil bind height of 1.070\".\n\nThis kit is compatible with all 15° LS cylinder heads, including LS1, LS2, LS3, LS4, LS6, L76, L92, L99, L33, and LSA. It typically works with LS7 heads when a .030\" shim (SS030) is used. However, this kit will not fit LS9 engines; part # SK006 is required for LS9 heads. For builds using roller rocker arms, part # SK002 is recommended.","brand":"Brian Tooley","offers":[{"title":"Default Title","offer_id":52687291187512,"sku":"SK001\/PR7400","price":319.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/661666453.jpg?v=1784882312","url":"https:\/\/store.motormia.co\/products\/platinum-660-dual-spring-kit","provider":"MOTORMIA","version":"1.0","type":"link"}