{"product_id":"manley-chevy-ls-6-head-small-block-severe-duty-pro-flo-exhaust-valves-set-of-8","title":"Manley Chevy LS-6 Head Small Block Severe Duty\/Pro Flo 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":49064140767467,"sku":"MAN11677-8","price":301.07,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0815\/2101\/7067\/files\/8e0126c4a09986cb016b4c5b0385eb13L_8a11e54d-b34d-4326-aa01-844211719d48.jpg?v=1784262101","url":"https:\/\/gearheadmotoring.com\/products\/manley-chevy-ls-6-head-small-block-severe-duty-pro-flo-exhaust-valves-set-of-8","provider":"GEARHEAD MOTORING LLC","version":"1.0","type":"link"}