{"product_id":"manley-performance-11805-8","title":"Manley Performance Manley Ford 351C 1.710 Inch Head Diameter \/ .3415 Inch Stem \/ Diameter Stock Height ( Set of 8)","description":"\u003cp\u003eManley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH-428 for exhaust and NK-844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. Built for those who demand race-winning strength and precision, Manley Severe Duty® Valves set the industry standard for performance and endurance.\u003c\/p\u003e\u003cp\u003eGenuine Manley Performance. Part number 11805-8.\u003c\/p\u003e\u003cp\u003eImported to order from our US supply partner — allow 7-14 days delivery.\u003c\/p\u003e","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":65547526766941,"sku":"11805-8","price":313.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1069\/0009\/5325\/files\/cb287168807169beb5cec74c14444d7dL_764ea0a7-01ef-4b55-9ee1-ce59fdc18433.jpg?v=1787708823","url":"https:\/\/performancepartsdirect.co.uk\/products\/manley-performance-11805-8","provider":"Performance Parts Direct","version":"1.0","type":"link"}