{"product_id":"stainless-steel-valves-chrome-stems","title":"Stainless Steel Valves, Chrome Stems","description":"The Manley Severe Duty® Series intake valves are a top-tier component for high-performance engine builds, designed for applications below 8000 RPM. These valves are constructed from advanced NK-842 stainless steel for intake and XH-428 for exhaust, ensuring superior strength and heat resistance. The intake valves feature a 2.165-inch head diameter and a 0.3133-inch stem diameter, with an overall length of 4.900 inches. They are equipped with chrome stems and hard tips for enhanced durability and longevity, and utilize GM LS OEM-style radius keeper grooves.\n\nEngineered with Pro Flo Technology, these valves are swirl polished and have fully machined combustion faces to maximize airflow and improve combustion efficiency. Manley's Severe Duty® valves have demonstrated exceptional durability in rigorous fatigue testing, enduring up to 100 million cycles at high stress levels, significantly outperforming competitor offerings. They are specifically designed for high-temperature gasoline engines, offering nearly double the ultimate tensile strength at 1500°F compared to competing exhaust valve materials and over four times the strength of competitor intake valve materials at 1000°F.\n\nThese valves are compatible with LS3\/L92\/LS99 cylinder heads and are a direct replacement designed to work with stock installed heights. Each set contains 8 intake valves.","brand":"Manley","offers":[{"title":"Default Title","offer_id":52662901604664,"sku":"660-11686-8","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687502204.jpg?v=1784321811","url":"https:\/\/store.motormia.co\/products\/stainless-steel-valves-chrome-stems","provider":"MOTORMIA","version":"1.0","type":"link"}