{"product_id":"manley-chevrolet-big-block-1-940in-head-dia-6-400in-oal-0-3415in-stem-exhaust-valve-single","title":"Manley Chevrolet Big Block 1.940in Head Dia. \/ 6.400in OAL \/ 0.3415in Stem \/ Exhaust Valve - Single","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":52155991097624,"sku":"MAN11583-1","price":85.99,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0804\/8662\/9656\/files\/f9b5e32303fea85f64f9fc13ba07de41L_a7b5b8b4-c8e1-428d-9be4-ae11f31f9bda.jpg?v=1780918891","url":"https:\/\/revrunners.com.au\/pl\/products\/manley-chevrolet-big-block-1-940in-head-dia-6-400in-oal-0-3415in-stem-exhaust-valve-single","provider":"REVRUNNERS","version":"1.0","type":"link"}