{"product_id":"manley-chevy-small-block-ls3-l99-l92-head-1-6in-head-dia-severe-duty-exhaust-valves-set-of-8","title":"Manley Chevy Small Block LS3\/L99 (L92 Head) 1.6in Head Dia. Severe Duty 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":43634294653105,"sku":"MAN12355-8","price":301.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/0779\/0001\/files\/8abcc06748efc38771788b16aecbc122_b3d6d7f7-9a5f-49d7-b36c-7c8fe3d2359b.jpg?v=1712061449","url":"https:\/\/supreme-mods.com\/products\/manley-chevy-small-block-ls3-l99-l92-head-1-6in-head-dia-severe-duty-exhaust-valves-set-of-8","provider":"Supreme-Mods.com","version":"1.0","type":"link"}