{"product_id":"manley-ford-427-medium-hi-riser-tunnel-port-1-750-dia-dish-severe-duty-exhaust-valves-set-of-8","title":"Manley Ford 427 (Medium\/Hi Riser\/Tunnel Port) 1.750 Dia Dish Severe Duty Exhaust Valves (Set of 8)","description":"Manley 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.","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":45382597902524,"sku":"MAN11825-8","price":317.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0637\/7321\/2860\/files\/76874d351cddb7a631ed11e522e98af1_dcedf02e-299b-4832-a4bf-e71e7dddf48f.jpg?v=1762082233","url":"https:\/\/daringracing.com\/products\/manley-ford-427-medium-hi-riser-tunnel-port-1-750-dia-dish-severe-duty-exhaust-valves-set-of-8","provider":"Daring Racing LLC","version":"1.0","type":"link"}