{"product_id":"manley-chevy-l83-5-3l-1-560in-head-diameter-pro-flo-severe-duty-exhaust-valve-set-of-8","title":"Manley Chevy L83 5.3L 1.560in Head Diameter Pro Flo\/Severe Duty Exhaust Valve (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":45737195471062,"sku":"MAN12361-8","price":344.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/9012\/9366\/files\/c2008e4f5a51a63cc4bb171d46e63bb4_b6c316da-d390-4253-a132-6183c6adc6d2.jpg?v=1717589137","url":"https:\/\/warautoparts.com\/products\/manley-chevy-l83-5-3l-1-560in-head-diameter-pro-flo-severe-duty-exhaust-valve-set-of-8","provider":"War Auto Parts","version":"1.0","type":"link"}