{"product_id":"dual-polished-valve-springs-kit-660-max-lift","title":"Dual Polished Valve Springs Kit, .660\" Max Lift","description":"Designed for use with stock rocker arms, this kit is a direct drop-in for 15° LS heads. It can also typically be used with LS7 heads when paired with a .030” shim (part number SS030) or a .045” shim (parts SS015 +SS030). For those using roller rockers, BTR offers part number SK002.\n\nThis comprehensive kit includes 16 dual polished SP001-1 springs, 32 VL7°8MM-1 locks, and 16 retainers available in either titanium (SR001-1) or chromoly steel (SR001S-1). It also comes with 16 locators suitable for stock or bronze guides and 16 VS LS valve seals. The spring specifications include 155 lbs of seat pressure at 1.780\", 380 lbs at 1.180\", and 400 lbs of open pressure at 1.130\", with a coil bind at 1.070\".\n\nCrucially, this kit will not fit LS9 engines; for LS9 heads, part number SK006 should be used.","brand":"Brian Tooley Racing","offers":[{"title":"Default Title","offer_id":52664238276920,"sku":"SK001-7400","price":319.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687724181.jpg?v=1784335727","url":"https:\/\/store.motormia.co\/products\/dual-polished-valve-springs-kit-660-max-lift","provider":"MOTORMIA","version":"1.0","type":"link"}