{"title":"Exhaust Valves","description":"","products":[{"product_id":"gsc-power-division-super-alloy-std-size-exhaust-valve-for-the-52l-voodoo-and-predator","title":"GSC Power-Division Super Alloy STD Size Exhaust Valve for the 5.2L Voodoo \u0026 Predator","description":"\u003cp style=\"text-align: justify;\"\u003eWhen creating our valves we set out to create the best performance, longest lasting valves available to the aftermarket. Using advanced 3D design and simulation software, we have created a stronger and higher flowing valve head design. We flow test prototype valve heads in the specific applications to make sure we have the highest flowing valve head available on the market.\u003c\/p\u003e\n\u003cp style=\"text-align: justify;\"\u003eWith the materials used, we have less valve distortion at the face than any of the tested designs. Less distortion allows for better sealing under extreme conditions and more consistent performance throughout the life of the valve.\u003cbr\u003e \u003c\/p\u003e","brand":"GSC Power Division","offers":[{"title":"Set (8)","offer_id":46908417704174,"sku":"GSC2175-8","price":387.7,"currency_code":"USD","in_stock":true},{"title":"Single Valve (1)","offer_id":46908417736942,"sku":"GSC2175-01","price":50.23,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/2425\/6494\/files\/gsc-power-division-GSC2175-1.png?v=1769527760"},{"product_id":"gsc-power-division-super-alloy-exhaust-valves-for-audi-r8-5-2l-lamborghini-huracan-5-2l-v10","title":"GSC Power Division Super Alloy Exhaust Valves for Audi R8 5.2L","description":"\u003cp\u003eUpgrade your Audi R8 5.2L V10 or Lamborghini Huracán 5.2L V10 with GSC Power Division Super Alloy Performance Exhaust Valves, built for superior airflow, efficiency, and durability in turbocharged and naturally aspirated engines.\u003c\/p\u003e\n\u003cp\u003eThe back cut design improves airflow, increasing power output and RPM potential. Micro-polished valve stems reduce friction and oil retention, ensuring smoother operation and longer component life, even at high RPMs.\u003c\/p\u003e\n\u003cp\u003eCrafted from super alloy materials, these valves withstand the extreme heat and stress of turbo and supercharged engines. Hardened valve tips ensure extended durability and optimal contact with the rocker or valve tappet.\u003c\/p\u003e\n\u003cp\u003eDesigned for OEM replacement, these valves fit seamlessly with OEM keeper\/lock systems. GSC Power Division recommends using new valve locks in performance setups to avoid material grooving.\u003c\/p\u003e\n\u003cp\u003eSold individually or as a set of 10 (1 set of 10 per head bank, 2 sets required for complete engine)\u003c\/p\u003e","brand":"GSC Power Division","offers":[{"title":"Set ( 10 )","offer_id":46983932936430,"sku":"GSC2251-10","price":408.75,"currency_code":"USD","in_stock":true},{"title":"Single Valve ( 1 )","offer_id":46983932969198,"sku":"GSC2251-01","price":42.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/2425\/6494\/files\/gsc-power-division-GSC2251-2.png?v=1769527923"},{"product_id":"gsc-power-division-exhaust-valves-for-audi-2-5l-daza-dnwa-5-cylinder-engine","title":"GSC Power Division Exhaust Valves for Audi 2.5L DAZA\/DNWA 5 Cylinder Engine","description":"\u003cp\u003eUpgrade your Audi Daza\/DNWA Engine with GSC Power Division Super Alloy Performance Exhaust Valves, built for superior airflow, efficiency, and durability in turbocharged engines.\u003c\/p\u003e\n\u003cp\u003eThe back cut design improves airflow, increasing power output and RPM potential. Micro-polished valve stems reduce friction and oil retention, ensuring smoother operation and longer component life, even at high RPMs.\u003c\/p\u003e\n\u003cp\u003eCrafted from super alloy materials, these valves withstand the extreme heat and stress of turbo and supercharged engines. Hardened valve tips ensure extended durability and optimal contact with the rocker or valve tappet.\u003c\/p\u003e\n\u003cp\u003eDesigned for OEM replacement, these valves fit seamlessly with OEM keeper\/lock systems. GSC Power Division recommends using new valve locks in performance setups to avoid material grooving.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSold individually or as a set of 10\u003c\/strong\u003e\u003c\/p\u003e","brand":"GSC Power Division","offers":[{"title":"Set ( 10 )","offer_id":46984265171182,"sku":"GSC2257-10","price":429.35,"currency_code":"USD","in_stock":true},{"title":"Single ( 1 )","offer_id":46984265203950,"sku":"GSC2257-01","price":44.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/2425\/6494\/files\/gsc-power-division-GSC2257-10.png?v=1770763396"},{"product_id":"gsc-power-division-super-alloy-std-exhaust-valve-toyota-bmw-b58-s58-engines","title":"GSC Power-Division Super Alloy STD Exhaust Valve Toyota \/ BMW B58 \/ S58 Engines","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eGSC Power-Division Super Alloy Exhaust Valves for the B58 and S58 Engines are for those running high horsepower, high EGT set ups that need a valve that will last in 2000°F conditions. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Super Alloy Exhaust valves have chrome polished stems to create a smooth, durable finish for added life and better lubricity, especially when paired with the GSC Manganese bronze valve guides. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eStrength, heat resistance, and performance are engineered into every valve. Under head dish is maximized for weight savings while swirl polished and backcut heads promote better air flow without sacrificing durability.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eValve Size\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSTD size Head 28.5mm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GSC Power Division","offers":[{"title":"Set ( 12 )","offer_id":46986058760430,"sku":"GSC2091-12","price":492.3,"currency_code":"USD","in_stock":true},{"title":"Single ( 1 )","offer_id":46986058793198,"sku":"GSC2091-01","price":42.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/2425\/6494\/files\/gsc-power-division-GSC2091-2.png?v=1769526929"},{"product_id":"gsc-power-division-super-alloy-std-size-head-exhaust-valve-for-can-am-maverick-turbo","title":"GSC Power-Division Super Alloy STD Size Head Exhaust Valve for CAN-AM Maverick Turbo","description":"\u003cdiv data-message-id=\"7c9f3c6a-a042-4b56-980d-ca42c4aeb6e7\" data-message-author-role=\"assistant\"\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eWhen creating our valves we set out to create the best performance, longest lasting valves available to the aftermarket. Using advanced 3D design and simulation software, we have created a stronger and higher flowing valve head design. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWe flow test prototype valve heads in the specific applications to make sure we have the highest flowing valve head available on the market. With the materials used, we have less valve distortion at the face than any of the tested designs. Less distortion allows for better sealing under extreme conditions and more consistent performance throughout the life of the valve.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"GSC Power Division","offers":[{"title":"Set (6)","offer_id":46988885491950,"sku":"GSC2215-06","price":284.81,"currency_code":"USD","in_stock":true},{"title":"Single Valve (1)","offer_id":46988885524718,"sku":"GSC2215-01","price":49.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/2425\/6494\/files\/gsc-power-division-GSC2215-06-1.png?v=1775004129"},{"product_id":"gsc-power-division-super-alloy-1mm-head-exhaust-valve-for-can-am-maverick-turbo","title":"GSC Power-Division Super Alloy +1mm Head Exhaust Valve for CAN-AM Maverick Turbo","description":"\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"7c9f3c6a-a042-4b56-980d-ca42c4aeb6e7\"\u003e\n\u003cp\u003eOur high-performance valves are meticulously designed using advanced 3D modeling and rigorously tested, are engineered for aftermarket excellence.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"GSC Power Division","offers":[{"title":"Set (6)","offer_id":46988902858990,"sku":"GSC2217-06","price":288.19,"currency_code":"USD","in_stock":true},{"title":"Single Valve (1)","offer_id":46988902891758,"sku":"GSC2217-01","price":49.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/2425\/6494\/files\/gsc-power-division-GSC2217-1.png?v=1770762885"},{"product_id":"gsc-power-division-stainless-steel-std-size-head-exhaust-valve-for-5-0l-coyote-gen-3","title":"GSC Power-Division Stainless Steel STD Size Head Exhaust Valve for 5.0L Coyote GEN 3","description":"\u003cdiv data-property=\"briefDescription\" data-identifier=\"16674\" data-model=\"XLite\\Model\\Product\" class=\"brief-descr product-description\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003eThe GSC offering of exhaust valves for the Ford Coyote features a \u003c\/span\u003e\u003cstrong style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003e45° valve seat\u003c\/strong\u003e\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003e contact angle, which differs from the OEM \u003c\/span\u003e\u003cstrong style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003e40° design\u003c\/strong\u003e\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003e.\u003c\/span\u003e Due to this change in the design, it will require a valve job to be performed to install these valves for proper sealing and valvetrain geometry.\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003cp\u003eWhen creating our valves, we set out to create the best performance, longest-lasting valves available to the aftermarket. Using advanced 3D design and simulation software, we have created a stronger and higher-flowing valve head design. We flow test prototype valve heads in the specific applications to make sure we have the highest flowing valve head available on the market. With the materials used, we have less valve distortion at the face than any of the tested designs. Less distortion allows for better sealing under extreme conditions and more consistent performance throughout the life of the valve.\u003cbr\u003e \u003c\/p\u003e\n\u003c\/div\u003e","brand":"GSC Power Division","offers":[{"title":"Set ( 8 )","offer_id":47008344441070,"sku":"GSC2161-8","price":262.62,"currency_code":"USD","in_stock":true},{"title":"Single ( 1 )","offer_id":47008344473838,"sku":"GSC2161-01","price":33.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/2425\/6494\/files\/gsc-power-division-GSC2161-1.png?v=1770762693"},{"product_id":"gsc-power-division-stainless-steel-1mm-head-exhaust-valve-for-5-0l-coyote-gen-3","title":"GSC Power-Division Stainless Steel +1mm Head Exhaust Valve for 5.0L Coyote GEN 3","description":"\u003cdiv class=\"brief-descr product-description\" data-model=\"XLite\\Model\\Product\" data-identifier=\"16674\" data-property=\"briefDescription\"\u003e\n\u003cp\u003eThe GSC offering of exhaust valves for the Ford Coyote feature a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e45° valve seat\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003econtact angle which differs from the OEM\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e40° design\u003c\/strong\u003e. Due to this change in the design it will require a valve job to be performed to install these valves for proper sealing and valvetrain geometry.\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003cp\u003eWhen creating our valves we set out to create the best performance, longest lasting valves available to the aftermarket. Using advanced 3D design and simulation software, we have created a stronger and higher flowing valve head design. We flow test prototype valve heads in the specific applications to make sure we have the highest flowing valve head available on the market. With the materials used, we have less valve distortion at the face than any of the tested designs. Less distortion allows for better sealing under extreme conditions and more consistent performance throughout the life of the valve. \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e","brand":"GSC Power Division","offers":[{"title":"Set ( 8 )","offer_id":47008512999662,"sku":"GSC2163-8","price":263.37,"currency_code":"USD","in_stock":true},{"title":"Single ( 1 )","offer_id":47008513032430,"sku":"GSC2163-01","price":34.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/2425\/6494\/files\/gsc-power-division-GSC2163-1.png?v=1770762484"},{"product_id":"gsc-power-division-super-alloy-std-size-exhaust-valve-for-the-5-0l-coyote-gen-3","title":"GSC Power-Division Super Alloy STD Size Exhaust Valve for the 5.0L Coyote GEN 3","description":"\u003cp\u003eThe GSC offering of exhaust valves for the Ford Coyote feature a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e45° valve seat\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003econtact angle which differs from the OEM\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e40° design\u003c\/strong\u003e. Due to this change in the design it will require a valve job to be performed to install these valves for proper sealing and valvetrain geometry.\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003cp\u003eWhen creating our valves we set out to create the best performance, longest lasting valves available to the aftermarket. Using advanced 3D design and simulation software, we have created a stronger and higher flowing valve head design. We flow test prototype valve heads in the specific applications to make sure we have the highest flowing valve head available on the market. With the materials used, we have less valve distortion at the face than any of the tested designs. Less distortion allows for better sealing under extreme conditions and more consistent performance throughout the life of the valve.\u003cbr\u003e \u003c\/p\u003e","brand":"GSC Power Division","offers":[{"title":"Set ( 8 )","offer_id":47008519520494,"sku":"GSC2165-8","price":381.33,"currency_code":"USD","in_stock":true},{"title":"Single ( 1 )","offer_id":47008519553262,"sku":"GSC2165-01","price":49.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/2425\/6494\/files\/gsc-power-division-GSC2165-2.png?v=1770762224"},{"product_id":"gsc-power-division-super-alloy-1mm-head-exhaust-valve-for-the-5-0l-coyote-gen-3","title":"GSC Power-Division Super Alloy +1mm Head Exhaust Valve for the 5.0L Coyote GEN 3","description":"\u003cp\u003eThe GSC offering of exhaust valves for the Ford Coyote feature a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e45° valve seat\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003econtact angle which differs from the OEM\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e40° design\u003c\/strong\u003e. Due to this change in the design it will require a valve job to be performed to install these valves for proper sealing and valvetrain geometry.\u003cbr\u003e\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003e\u003cbr\u003eWhen creating our valves we set out to create the best performance, longest lasting valves available to the aftermarket. Using advanced 3D design and simulation software, we have created a stronger and higher flowing valve head design. We flow test prototype valve heads in the specific applications to make sure we have the highest flowing valve head available on the market. With the materials used, we have less valve distortion at the face than any of the tested designs. Less distortion allows for better sealing under extreme conditions and more consistent performance throughout the life of the valve.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"GSC Power Division","offers":[{"title":"Set ( 8 )","offer_id":47008520601838,"sku":"GSC2167-8","price":386.57,"currency_code":"USD","in_stock":true},{"title":"Single ( 1 )","offer_id":47008520634606,"sku":"GSC2167-01","price":50.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/2425\/6494\/files\/gsc-power-division-GSC2167-2.png?v=1770762054"},{"product_id":"gsc-power-division-exhaust-valve-28mm-std-for-the-honda-b-series-dohc-vtec","title":"GSC Power-Division Exhaust Valve 28mm (STD) for the Honda B-Series DOHC VTEC","description":"\u003cp\u003eWhen creating our new valve line we set out to create the best performance, longest lasting valves available to the aftermarket. Using advanced 3D design and simulation software, we have created a stronger and higher flowing valve head design.\u003c\/p\u003e\n\u003cp\u003eWe flow test prototype valve heads in the specific applications to make sure we have the highest flowing valve head available on the market today. With the materials used, we have less valve distortion at the face than any of the tested designs. Less distortion allows for better sealing under extreme conditions and more consistent performance throughout the life of the valve. GSC Power-Division's new valves are sure to become the industry standard for sport compact performance valves.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e","brand":"GSC Power Division","offers":[{"title":"Set ( 8 )","offer_id":47037414834414,"sku":"GSC2031-8","price":309.05,"currency_code":"USD","in_stock":true},{"title":"Single ( 1 )","offer_id":47037414867182,"sku":"GSC2031-01","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/2425\/6494\/files\/gsc-power-division-GSC2031-1.png?v=1770761866"},{"product_id":"gsc-power-division-exhaust-valve-29mm-1mm-for-the-honda-b-series-dohc-vtec","title":"GSC Power-Division Exhaust Valve 29mm (+1mm) for the Honda B-Series DOHC VTEC","description":"\u003cdiv class=\"brief-descr product-description\" data-model=\"XLite\\Model\\Product\" data-identifier=\"16322\" data-property=\"briefDescription\"\u003e\n\u003cp\u003eWhen creating our new valve line we set out to create the best performance, longest lasting valves available to the aftermarket. Using advanced 3D design and simulation software, we have created a stronger and higher flowing valve head design.\u003c\/p\u003e\n\u003cp\u003eWe flow test prototype valve heads in the specific applications to make sure we have the highest flowing valve head available on the market today. With the materials used, we have less valve distortion at the face than any of the tested designs. Less distortion allows for better sealing under extreme conditions and more consistent performance throughout the life of the valve. GSC Power-Division's new valves are sure to become the industry standard for sport compact performance valves.\u003cbr\u003e\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eValve Size\u003c\/strong\u003e\u003cbr\u003e+1mm - 29mm\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"GSC Power Division","offers":[{"title":"Set ( 8 )","offer_id":47037424009454,"sku":"GSC2033-8","price":150.03,"currency_code":"USD","in_stock":true},{"title":"Single ( 1 )","offer_id":47037424042222,"sku":"GSC2033-01","price":19.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/2425\/6494\/files\/gsc-power-division-GSC2033-1.png?v=1770761696"},{"product_id":"gsc-power-division-6mm-stem-super-alloy-exhaust-valve-28mm-std-for-the-honda-b-series-dohc-vtec","title":"GSC Power-Division 6mm Stem Super Alloy Exhaust Valve 28mm (STD) for the Honda B-Series DOHC VTEC","description":"\u003cp\u003e\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003eGSC Power-Division 6mm stem Super Alloy Exhaust Valves for the Honda B-Series are for those running high horsepower, high EGT set ups that need a valve that will last in 2000°F conditions. The Super Alloy Exhaust valves have chrome polished stems to create a smooth, durable finish for added life and better lubricity, especially when paired with the GSC Manganese bronze valve guides. Strength, heat resistance, and performance are engineered into every valve. Under head dish is maximized for weight savings while swirl polished and backcut heads promote better air flow without sacrificing durability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eGSC Power-Division 6mm Stem Super Alloy Exhaust Valve 28mm (STD) for the Honda B-Series DOHC VTEC \u003c\/p\u003e\n\u003cp\u003e6mm Stem \u003c\/p\u003e\n\u003cp\u003eSTD Size Head 28mm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cu\u003eUse with GSC3049-8 Exhaust Valve Guides\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"GSC Power Division","offers":[{"title":"Set ( 8 )","offer_id":47037448126702,"sku":"GSC2039-8","price":326.82,"currency_code":"USD","in_stock":true},{"title":"Single ( 1 )","offer_id":47037448159470,"sku":"GSC2039-01","price":42.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/2425\/6494\/files\/gsc-power-division-GSC2039-1.png?v=1770761540"},{"product_id":"gsc-power-division-exhaust-valve-30mm-std-for-the-honda-k-series-dohc-vtec","title":"GSC Power-Division Exhaust Valve 30mm (STD) for the Honda K-Series DOHC VTEC","description":"\u003cp\u003eWhen creating our new valve line we set out to create the best performance, longest lasting valves available to the aftermarket. Using advanced 3D design and simulation software, we have created a stronger and higher flowing valve head design. We flow test prototype valve heads in the specific applications to make sure we have the highest flowing valve head available on the market today. With the materials used, we have less valve distortion at the face than any of the tested designs.\u003c\/p\u003e\n\u003cp\u003eLess distortion allows for better sealing under extreme conditions and more consistent performance throughout the life of the valve. 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