{"product_id":"manley-severe-duty-series-small-block-chevy-stainless-steel-exhaust-valves-set-of-9","title":"Manley Severe Duty Series Small Block Chevy Stainless Steel 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":46282115907816,"sku":"MAN11763-8","price":319.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/0807\/2548\/files\/c2008e4f5a51a63cc4bb171d46e63bb4_0fff858b-85fa-486b-92f5-9b3935191394.jpg?v=1716880417","url":"https:\/\/store.ossmotorsport.com\/products\/manley-severe-duty-series-small-block-chevy-stainless-steel-exhaust-valves-set-of-9","provider":"OSS Motorsport","version":"1.0","type":"link"}