{"product_id":"manley-11563-1-exhaust-valve-severe-duty-series-1-880-head-dia-5-354-o-a-length-0-3715-stem-for-chevrolet-big-block","title":"MANLEY 11563-1 Exhaust Valve Severe Duty Series (1.880\" Head Dia., 5.354\" O\/A Length, 0.3715\" Stem) for CHEVROLET Big Block","description":"\u003ch2\u003eDescription MANLEY 11563-1 Severe Duty Series Chevrolet Big Block Exhaust Valve (1.880\" Head Dia., 5.354\" O\/A Length, 0.3715\" Stem)\u003c\/h2\u003e\u003cp\u003eManley Severe Duty Valves are designed for high-performance and racing applications. Exhaust valves are manufactured from XH-428 material, while Intake valves are manufactured from NK-844 material.\u003c\/p\u003e \u003cp\u003eSevere Duty Valves have undergone rigorous fatigue testing. During normal operation, valves experience 20,000 to 25,000 lbs of applied stress. When valves bounce on the seat, stress increases to 40,000 to 60,000 lbs.\u003c\/p\u003e \u003cul\u003e \u003cli\u003eDesigned for high-temperature gasoline engines\u003c\/li\u003e \u003cli\u003eChrome stems and hard tips for durability and longevity\u003c\/li\u003e \u003cli\u003eSwirl-polished under-head areas and fully machined combustion faces for improved Airflow and combustion efficiency\u003c\/li\u003e \u003cli\u003eXH-428 Exhaust valve material and NK-844 Intake valve material\u003c\/li\u003e \u003cli\u003eManley Exhaust valve fatigue test: 40,000 psi at 1400°F\u003c\/li\u003e \u003cli\u003eManley Exhaust valve fatigue life: Up to 100,000,000 cycles\u003c\/li\u003e \u003cli\u003eCompetitor fatigue life: 100,000 cycles\u003c\/li\u003e \u003cli\u003eXH-428 ultimate tensile strength at 1500°F: Nearly double that of EV-8\u003c\/li\u003e \u003cli\u003eNK-844 ultimate tensile strength at 1000°F: Over four times that of the competition’s best Intake valve material\u003c\/li\u003e \u003c\/ul\u003e\u003ch3\u003eSpecifications:\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eProduct Market: Domestic\u003c\/li\u003e \u003cli\u003eHead Diameter: 1.880 IN\u003c\/li\u003e \u003cli\u003eStem Diameter: 0.3715 IN\u003c\/li\u003e \u003cli\u003eValve Stem Diameter: 0.3715 IN\u003c\/li\u003e \u003cli\u003eO\/A Length: 5.354 IN\u003c\/li\u003e \u003cli\u003eTip Length: 0.220 IN\u003c\/li\u003e \u003cli\u003eMargin Width: 0.065 IN\u003c\/li\u003e \u003cli\u003eSeat Width: 0.100 IN\u003c\/li\u003e \u003cli\u003eTop of Head: 6 Degree Dish\u003c\/li\u003e \u003cli\u003eUnderhead Angle: 10.00 DEG\u003c\/li\u003e \u003cli\u003eEmissions Code: 3\u003c\/li\u003e \u003cli\u003eValve Series: Severe Duty Series\u003c\/li\u003e \u003cli\u003eValve Material: Stainless Steel\u003c\/li\u003e \u003cli\u003eValve Type: Exhaust\u003c\/li\u003e \u003cli\u003eProduct Type: Engine Exhaust Valve\u003c\/li\u003e \u003cli\u003eValve Quantity: 1\u003c\/li\u003e \u003c\/ul\u003e","brand":"MANLEY","offers":[{"title":"Default Title","offer_id":48696858018078,"sku":"11563-1","price":175.48,"currency_code":"AED","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/0553\/3982\/files\/image-coming-soon_f381e92b-481c-44c3-a83c-f8ce86ee5d64.png?v=1786614313","url":"https:\/\/atomic-shop.ae\/products\/manley-11563-1-exhaust-valve-severe-duty-series-1-880-head-dia-5-354-o-a-length-0-3715-stem-for-chevrolet-big-block","provider":"ATOMIC-SHOP Performance Parts \u0026 Motorsport Equipment - UAE","version":"1.0","type":"link"}