{"product_id":"manley-chevrolet-big-block-exhaust-valve-kit-1-900in-head-dia-6-450in-o-a-length-0-3415in-stem","title":"Manley Chevrolet Big Block Exhaust Valve Kit - 1.900in Head Dia. 6.450in O\/A Length, 0.3415in Stem","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\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":48472943395043,"sku":"MAN11597-8","price":514.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0776\/5632\/6371\/files\/3cbfe0073863f0dd8f3306422277fb93L_e30ee5b0-3a91-4846-bcfa-635de609583e.jpg?v=1773807224","url":"https:\/\/fast-world-problems.myshopify.com\/products\/manley-chevrolet-big-block-exhaust-valve-kit-1-900in-head-dia-6-450in-o-a-length-0-3415in-stem","provider":"Fast World Problems","version":"1.0","type":"link"}