{"product_id":"hamilton-cams-103-lb-24-valve-valve-spring-set-98-18-5-9l-6-7l-cummins","title":"Hamilton Cams 103 lb 24-Valve Valve Spring Set 98-18 5.9L 6.7L Cummins","description":"\u003cp\u003eOnce a 24-valve is seeing more than about 35 psi of boost or drive pressure, or turning past 3,800 RPM, the factory springs stop controlling the valvetrain. At 80 lbs of seat pressure at 1.380 inches they let valves get blown open under boost, which pulls exhaust gas back into the cylinder on the intake stroke and slows combustion. Above 3,800 RPM the same lack of pressure allows valve float, and valve float is what fractures cast tappets.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e103 lb seat pressure against 80 lbs for the factory spring\u003c\/li\u003e\n\u003cli\u003eControls the valvetrain to 4,500 RPM and 80 lbs of boost and drive pressure\u003c\/li\u003e\n\u003cli\u003ePrevents valves being forced open under high boost, and the reversion that follows\u003c\/li\u003e\n\u003cli\u003eHigher seat pressure with moderate nose pressure, so valvetrain control does not come at the cost of cam and tappet wear\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFitment\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1998.5-2007 Dodge Ram 5.9L Cummins 24-valve\u003c\/li\u003e\n\u003cli\u003e2007.5-2018 Ram 6.7L Cummins\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eNotes\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTool steel retainers are not included and are sold separately\u003c\/li\u003e\n\u003cli\u003eBeyond 4,500 RPM, step up to the Hamilton Cams 110 lb competition springs\u003c\/li\u003e\n\u003cli\u003eHamilton Cams warranties camshafts only when installed with Hamilton Cams tappets and valve springs.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Details\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBrand: Hamilton Cams\u003c\/li\u003e\n\u003cli\u003eManufacturer Part Number: 07-s-003\u003c\/li\u003e\n\u003cli\u003eUPC: 857340008711\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hamilton Cams","offers":[{"title":"Default Title","offer_id":47609121243309,"sku":"07-s-003","price":349.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/5200\/0173\/files\/PK-Shot-scaled.jpg?v=1789536918","url":"https:\/\/www.dfispdx.com\/products\/hamilton-cams-103-lb-24-valve-valve-spring-set-98-18-5-9l-6-7l-cummins","provider":"Diesel Fuel Injection Service","version":"1.0","type":"link"}