{"product_id":"manley-chrysler-440-1-exhaust-valve-kit-1-810in-head-dia-5-369in-o-a-length-0-3415in-stem","title":"Manley Chrysler 440-1 Exhaust Valve Kit - 1.810in Head Dia. 5.369in O\/A Length, 0.3415in Stem","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":51625278570792,"sku":"MAN11813-8","price":301.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0952\/0218\/1416\/files\/639c017773af16048d25285e221903acL_7631013d-2521-46f1-ad1f-0cbf90402ee7.jpg?v=1775418208","url":"https:\/\/shop.paradigm-automotive.com\/products\/manley-chrysler-440-1-exhaust-valve-kit-1-810in-head-dia-5-369in-o-a-length-0-3415in-stem","provider":"Paradigm Automotive \u0026 Performance Shop","version":"1.0","type":"link"}