{"product_id":"manley-chevy-big-block-chevy-1-880in-severe-duty-exhaust-valves","title":"Manley Chevy Big Block Chevy 1.880in Severe Duty Exhaust Valves","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":43574674292801,"sku":"MAN12843-8","price":301.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2637\/6001\/files\/639c017773af16048d25285e221903acL_4cffd9dc-2fc9-42bc-8036-f996dfd817db.jpg?v=1771331700","url":"https:\/\/shop.kingsperformance.com\/en-gb\/products\/manley-chevy-big-block-chevy-1-880in-severe-duty-exhaust-valves","provider":"Kings Performance","version":"1.0","type":"link"}