{"product_id":"manley-ford-429intake-valve-kit-2-300in-head-dia-5-725in-o-a-length-0-3415in-stem","title":"Manley Ford 429intake Valve Kit - 2.300in Head Dia. 5.725in 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":51625260417320,"sku":"MAN11588-8","price":311.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0952\/0218\/1416\/files\/7883e207528c4d373b7e83821f764b8aL_25b9a582-7658-4dc2-8300-3b2a8c94be50.jpg?v=1775418002","url":"https:\/\/shop.paradigm-automotive.com\/products\/manley-ford-429intake-valve-kit-2-300in-head-dia-5-725in-o-a-length-0-3415in-stem","provider":"Paradigm Automotive \u0026 Performance Shop","version":"1.0","type":"link"}