{"product_id":"manley-big-block-chevy-2-350in-diameter-0-350in-longer-length-extreme-duty-exhaust-valves-single","title":"Manley Performance 2.350in Diameter 0.350in Longer Length Extreme Duty Exhaust Valves - Single fits Chevy Big Block","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":44491841667279,"sku":"MAN11880-1","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0549\/4164\/7055\/files\/Manley-Big-Block-Chevy-2350in-Diameter-0350in-Long-1758629731.webp?v=1758629732","url":"https:\/\/www.cimotorsports.com\/products\/manley-big-block-chevy-2-350in-diameter-0-350in-longer-length-extreme-duty-exhaust-valves-single","provider":"CI Motorsports","version":"1.0","type":"link"}