{"product_id":"manley-chevy-lt-1-6-2l-1-590in-head-diameter-pro-flo-severe-duty-exhaust-valves-set-of-8-12347-8","title":"Manley Chevy LT-1 6.2L 1.590in Head Diameter Pro Flo\/Severe Duty Exhaust Valves (Set of 8) - 12347-8","description":"\u003cp\u003eManley 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.\u003c\/p\u003e\n\u003cp\u003eManley Valve - Exhaust, Valve-S\/D LT1 6.2L 1.590, .3136 STEM.\u003c\/p\u003e\n\u003ch4\u003eFeatures \u0026amp; Benefits\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSwirl polishing and machined faces improved airflow\/optimized efficiency\u003c\/li\u003e\n\u003cli\u003eExotic alloys for superior tensile strength, reliability, and longevity\u003c\/li\u003e\n\u003cli\u003eProven fatigue strength for extreme performance\u003c\/li\u003e\n\u003cli\u003eChrome stems and hard tips enhance durability\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":46460691775624,"sku":"man12347-8","price":301.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/2491\/6104\/files\/9f3fe65eab22c1b800b67cb4ba0de39eL_7fc45983-1c2b-487d-afc3-bc2d3651f7e8.jpg?v=1787944735","url":"https:\/\/www.allianceracing.com\/products\/manley-chevy-lt-1-6-2l-1-590in-head-diameter-pro-flo-severe-duty-exhaust-valves-set-of-8-12347-8","provider":"Alliance Racing","version":"1.0","type":"link"}