{"product_id":"d-105-kit-12v","title":"1989-98 5.9L 12 valve Cummins - Conical Valve Spring Kit","description":"\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eManton Heavy Duty 12v Conical Springs, Billet Retainers \u0026amp; Lock Kit\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFor the 1989-98 12v 5.9L Cummins engines.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpring Specs:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003cp\u003e170lb seat pressure at 1.940 installed height \/ 375lbs. at 1.275 open height\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003eCoil binds 1.225 ( max valve lift accommodation of .650 if installed @ 1.940)\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003eDesigned for up-to 6,500rpm\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003esafe for daily driving \u0026amp; race capable If your running over 40psi \u0026amp; 3700rpm, this is one of the kits for you. Other options available too. Stronger pushrods are recommended when running this kit.\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eUpgrade your 12V 5.9L engine with Manton Heavy Duty Conical Springs, Billet Retainers \u0026amp; Lock Kit. Ideal for engines running over 40psi and 3,700rpm; stronger pushrods recommended for this setup. Protects valves from being pushed open under high boost conditions, enhancing efficiency and longevity. Engineered for high boost capability and maximum valve train stability. Perfect for stock rebuilds or high-performance race applications. Lightweight 7-degree billet steel retainers designed to match conical spring shape, stronger than OEM. Includes 7-degree valve locks designed for these retainers. Heat-treated spring shims available in various thicknesses for adjusting seat pressure to accommodate max boost.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Manton Diesel","offers":[{"title":"Default Title","offer_id":67809860321479,"sku":"D-105-Kit-12v","price":436.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0789\/1953\/2743\/files\/1787334717935-567298081.jpg?v=1790952180","url":"https:\/\/mantonpushrods.com\/products\/d-105-kit-12v","provider":"Manton Racing Products","version":"1.0","type":"link"}