{"product_id":"manley-chevy-lt-1-6-2l-1-590in-head-diameter-pro-flo-severe-duty-exhaust-valves-set-of-8","title":"Manley Chevy LT-1 6.2L 1.590in Head Diameter Pro Flo\/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":42381547405417,"sku":"MAN12347-8","price":301.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0567\/3949\/6041\/files\/c2008e4f5a51a63cc4bb171d46e63bb4.jpg?v=1751469999","url":"https:\/\/velocityfactor.shop\/products\/manley-chevy-lt-1-6-2l-1-590in-head-diameter-pro-flo-severe-duty-exhaust-valves-set-of-8","provider":"Velocity Factor","version":"1.0","type":"link"}