{"product_id":"manley-ford-429-exhaust-valve-kit-1-760in-head-dia-5-067in-o-a-length-0-3415in-stem","title":"Manley Ford 429 Exhaust Valve Kit - 1.760in Head Dia. 5.067in 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":47489375043798,"sku":"MAN11529-8","price":344.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/9012\/9366\/files\/1ecc177028ebb28898eba0253019ba05L_d1276a74-9052-4841-917e-53ca2e829043.jpg?v=1763192423","url":"https:\/\/warautoparts.com\/products\/manley-ford-429-exhaust-valve-kit-1-760in-head-dia-5-067in-o-a-length-0-3415in-stem","provider":"War Auto Parts","version":"1.0","type":"link"}