{"product_id":"manley-chevrolet-small-block-exhaust-valve-kit-1-600in-head-dia-5-021in-o-a-length-0-3415in-stem-11869-8","title":"Manley Chevrolet Small Block Exhaust Valve Kit - 1.600in Head Dia. 5.021in O\/A Length, 0.3415in Stem - 11869-8","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 1.600,+.100.\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":46460629581960,"sku":"man11869-8","price":301.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/2491\/6104\/files\/9f3fe65eab22c1b800b67cb4ba0de39eL_cf820459-c571-4a92-9191-1cc3dac32df2.jpg?v=1787944310","url":"https:\/\/www.allianceracing.com\/products\/manley-chevrolet-small-block-exhaust-valve-kit-1-600in-head-dia-5-021in-o-a-length-0-3415in-stem-11869-8","provider":"Alliance Racing","version":"1.0","type":"link"}