{"product_id":"manley-sbc-1-600-severe-duty-exhaust-valves-set-of-9","title":"Manley Performance SBC 1.600 Severe Duty Exhaust Valves (Set of 8) 11771-8","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":44491838881999,"sku":"MAN11771-8","price":301.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0549\/4164\/7055\/files\/Manley-SBC-1600-Severe-Duty-Exhaust-Valves-Set-of--1758676754.webp?v=1758676755","url":"https:\/\/www.cimotorsports.com\/products\/manley-sbc-1-600-severe-duty-exhaust-valves-set-of-9","provider":"CI Motorsports","version":"1.0","type":"link"}