{"product_id":"manley-chevy-big-block-stock-3-8-inch-severe-duty-intake-valves-set-of-8","title":"Manley Performance Stock 3\/8 inch Severe Duty Intake Valves (Set of 8) 11562-8 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":44491829739727,"sku":"MAN11562-8","price":301.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0549\/4164\/7055\/files\/Manley-Chevy-Big-Block-Stock-38-inch-Severe-Duty-I-1758649566.webp?v=1758649567","url":"https:\/\/www.cimotorsports.com\/products\/manley-chevy-big-block-stock-3-8-inch-severe-duty-intake-valves-set-of-8","provider":"CI Motorsports","version":"1.0","type":"link"}