{"product_id":"gsc-p-d-mitsubishi-4g63t-evo-1-9-polished-super-alloy-exhaust-valve-30-5mm-head-std-single","title":"GSC Super Alloy Exhaust Valve for 1990-2006 Mitsubishi 4G63T","description":"\u003ch4\u003eProtect a high-heat 4G63T build with the correct single exhaust valve\u003c\/h4\u003e\u003cp\u003eGSC Power Division 2005-01 is one standard-size super-alloy exhaust valve for the supported Mitsubishi 4G63T cylinder heads. Its chrome-polished stem, back-cut head, and under-head dish are intended for high-output engines where exhaust temperature and sealing stability matter.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eGSC Power Division 2005-01 is sold as one exhaust valve, not a set of eight\u003c\/li\u003e\n\u003cli\u003eSuper-alloy construction is intended for exhaust temperatures up to 2,000 degrees Fahrenheit\u003c\/li\u003e\n\u003cli\u003eChrome-polished stem supports a smooth bearing surface and lubricity\u003c\/li\u003e\n\u003cli\u003eSwirl-polished, back-cut head promotes airflow while retaining strength\u003c\/li\u003e\n\u003cli\u003eUnder-head dish reduces valve mass\u003c\/li\u003e\n\u003cli\u003eStandard 30.5 mm head diameter for the verified 4G63T applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFitment\u003c\/h4\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eVerified Trim or Engine\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1992-2006\u003c\/td\u003e\n\u003ctd\u003eMitsubishi\u003c\/td\u003e\n\u003ctd\u003eLancer Evolution I-IX\u003c\/td\u003e\n\u003ctd\u003e4G63T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1990-1999\u003c\/td\u003e\n\u003ctd\u003eMitsubishi\u003c\/td\u003e\n\u003ctd\u003eEclipse\u003c\/td\u003e\n\u003ctd\u003eGST or GSX with 4G63T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1990-1998\u003c\/td\u003e\n\u003ctd\u003eEagle\u003c\/td\u003e\n\u003ctd\u003eTalon\u003c\/td\u003e\n\u003ctd\u003eTSi with 4G63T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1990-1994\u003c\/td\u003e\n\u003ctd\u003ePlymouth\u003c\/td\u003e\n\u003ctd\u003eLaser\u003c\/td\u003e\n\u003ctd\u003eRS Turbo with 4G63T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1991-1992\u003c\/td\u003e\n\u003ctd\u003eMitsubishi\u003c\/td\u003e\n\u003ctd\u003eGalant\u003c\/td\u003e\n\u003ctd\u003eVR-4 with 4G63T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number\u003c\/td\u003e\n\u003ctd\u003e2005-01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePosition\u003c\/td\u003e\n\u003ctd\u003eExhaust\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003eOne valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eSuper alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead Diameter\u003c\/td\u003e\n\u003ctd\u003e30.5 mm, standard size\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStem Diameter\u003c\/td\u003e\n\u003ctd\u003e6.6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Length\u003c\/td\u003e\n\u003ctd\u003e109.20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStem Finish\u003c\/td\u003e\n\u003ctd\u003eChrome polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead Design\u003c\/td\u003e\n\u003ctd\u003eSwirl polished, back cut, under-head dish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Family\u003c\/td\u003e\n\u003ctd\u003eMitsubishi 4G63T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch4\u003eWhat's Included\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eOne GSC Power Division 2005-01 super-alloy exhaust valve\u003c\/li\u003e\n\u003cli\u003eValve seals, guides, springs, retainers, locks, machining, and the other seven exhaust valves are not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eAbout GSC Power Division\u003c\/h4\u003e\u003cp\u003eGSC Power Division develops performance valvetrain components with application-specific stem, head, length, material, and airflow geometry. Its super-alloy exhaust valves are intended for severe exhaust heat, but the cylinder head and valve-seat condition must be measured before installation.\u003c\/p\u003e\u003ch4\u003eRelated Parts\u003c\/h4\u003e\u003cul\u003e\u003cli\u003eNo internal part is linked because guides, seals, springs, retainers, locks, and companion valves must match the exact 4G63T cylinder-head build and GSC 2005-01 dimensions.\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eFAQ\u003c\/h4\u003e\u003cstrong\u003eWhat is the 2005-01?\u003c\/strong\u003e\u003cp\u003eIt is one standard-size super-alloy exhaust valve for the supported Mitsubishi 4G63T applications.\u003c\/p\u003e\u003cstrong\u003eIs this a complete set of exhaust valves?\u003c\/strong\u003e\u003cp\u003eNo. The verified quantity is one valve; a four-cylinder head normally requires eight exhaust valves when replacing a complete set.\u003c\/p\u003e\u003cstrong\u003eWhat is the valve-head diameter?\u003c\/strong\u003e\u003cp\u003eThe verified head diameter is 30.5 millimeters, the standard size for the listed configuration.\u003c\/p\u003e\u003cstrong\u003eWhat are the stem diameter and overall length?\u003c\/strong\u003e\u003cp\u003eThe published dimensions are a 6.6-millimeter stem and a 109.20-millimeter overall length.\u003c\/p\u003e\u003cstrong\u003eIs this the stainless-steel version?\u003c\/strong\u003e\u003cp\u003eNo. This listing is the super-alloy version intended for higher exhaust-gas temperatures.\u003c\/p\u003e\u003cstrong\u003eDoes it fit every 4G63 engine?\u003c\/strong\u003e\u003cp\u003eNo. Confirm the turbocharged 4G63T cylinder head, valve size, stem size, overall length, seat geometry, and application before ordering.\u003c\/p\u003e\u003cstrong\u003eDoes a standard-size valve eliminate machining?\u003c\/strong\u003e\u003cp\u003eNo. The guide, seat, installed height, sealing contact, and complete valvetrain geometry still require professional inspection and correction as needed.\u003c\/p\u003e\u003cstrong\u003eWhat should be checked after assembly?\u003c\/strong\u003e\u003cp\u003eVerify valve-to-seat contact, guide clearance, installed height, spring pressure, retainer and lock engagement, piston clearance, and leak-down before running the engine.\u003c\/p\u003e\u003ch4\u003eInstallation Instructions\u003c\/h4\u003e\u003col\u003e\n\u003cli\u003eConfirm the exact 4G63T cylinder head and GSC Power Division 2005-01 dimensions before disassembly.\u003c\/li\u003e\n\u003cli\u003eHave a qualified engine machinist measure the original valve, guide, seat, installed height, and cylinder-head condition.\u003c\/li\u003e\n\u003cli\u003eClean and inspect the replacement valve without scratching the polished stem or sealing face.\u003c\/li\u003e\n\u003cli\u003eMachine or service the guide and seat only to the current GSC and engine-builder specifications, then verify concentric contact and clearance.\u003c\/li\u003e\n\u003cli\u003eInstall the correct seal, spring, retainer, and locks for the complete valvetrain combination and measure installed height and pressure.\u003c\/li\u003e\n\u003cli\u003eCheck piston-to-valve clearance, rotate the engine by hand, perform leak-down checks, and follow the engine builder's startup procedure.\u003c\/li\u003e\n\u003c\/ol\u003e\u003cp\u003e\u003cstrong\u003eCalifornia Proposition 65 Warning:\u003c\/strong\u003e This product can expose you to chemicals including antimony oxide and other chemicals known to the State of California to cause cancer or reproductive harm. For more information, visit www.P65Warnings.ca.gov.\u003c\/p\u003e","brand":"GSC Power Division","offers":[{"title":"Default Title","offer_id":68151298555983,"sku":"GSC2005-01","price":32.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/gsc-power-division-2005-01-single-super-alloy-exhaust-valve-01.webp?v=1794587313","url":"https:\/\/www.blackopsautoworks.com\/products\/gsc-p-d-mitsubishi-4g63t-evo-1-9-polished-super-alloy-exhaust-valve-30-5mm-head-std-single","provider":"Black Ops Auto Works","version":"1.0","type":"link"}