{"product_id":"supertech-gde-nka24-7-ei-os-8-valve-guides-240sx-xterra-frontier","title":"Supertech Nissan KA24 Manganese Brnz Intake\/ Exhaust Guide 39.6mm x 6.98mm x 11.05 +0.02mm- Set of 8","description":"\u003ch4\u003eStop Oil Burning and Restore Compression With Precision Manganese Bronze Valve Guides\u003c\/h4\u003e\n\u003cp\u003eWorn factory valve guides let oil creep past the stems and allow the valves themselves to wander off-center, robbing your KA24DE of compression and clean combustion. The Supertech GDE-NKA24-7-EI-OS-8 set replaces all 8 intake and exhaust guides with precision-machined manganese bronze guides engineered for consistent oil control and accurate valve seating on rebuilds, head refreshes, and performance builds alike.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eFull set of 8 guides (4 intake, 4 exhaust) covers a complete KA24DE cylinder head\u003c\/li\u003e\n\u003cli\u003eHigh quality manganese bronze construction for excellent wear resistance and heat dissipation\u003c\/li\u003e\n\u003cli\u003eOversize (+0.02mm) fit for reboring worn factory guide bores during a head rebuild\u003c\/li\u003e\n\u003cli\u003eEngineered to pair with Supertech low friction black nitride valves for reduced stem wear\u003c\/li\u003e\n\u003cli\u003ePrecision-held tolerances for accurate valve seating and consistent oil control\u003c\/li\u003e\n\u003cli\u003eDirect fit for GDE-NKA24-7-EI-OS-8 machining specifications, no modification required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFitment\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eYear Range\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1991-1998\u003c\/td\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003e240SX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2004\u003c\/td\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003eXterra\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1998-2004\u003c\/td\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003eFrontier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number\u003c\/td\u003e\n\u003ctd\u003eGDE-NKA24-7-EI-OS-8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSupertech\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Application\u003c\/td\u003e\n\u003ctd\u003eNissan KA24DE DOHC 16v 2.4L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuide Material\u003c\/td\u003e\n\u003ctd\u003eManganese Bronze\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e11.03mm (+0.02mm oversize)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e39.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003eSet of 8 (4 intake, 4 exhaust)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCondition\u003c\/td\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003eNot assigned by manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e4 intake valve guides\u003c\/li\u003e\n\u003cli\u003e4 exhaust valve guides\u003c\/li\u003e\n\u003cli\u003eManufacturer packaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eAbout Supertech\u003c\/h4\u003e\n\u003cp\u003eSupertech Performance specializes in precision valvetrain components for racing and street performance engines, including valves, springs, retainers, and guides machined to tight tolerances for durability under sustained high-RPM use. Their manganese bronze guides are a common choice for engine builders looking to correct worn factory bores during a head rebuild.\u003c\/p\u003e\n\u003ch4\u003eRelated Parts on Our Site\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/valve-guides\" target=\"_blank\" rel=\"noopener\"\u003eShop More Valve Guides\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/performance\" target=\"_blank\" rel=\"noopener\"\u003eShop Performance Engine Parts\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFAQ\u003c\/h4\u003e\n\u003cstrong\u003eWhat is the GDE-NKA24-7-EI-OS-8?\u003c\/strong\u003e\n\u003cp\u003eThe GDE-NKA24-7-EI-OS-8 is a set of 8 manganese bronze intake and exhaust valve guides sized for the Nissan KA24DE 2.4L DOHC engine, cut to a +0.02mm oversize for rebuilding worn factory guide bores.\u003c\/p\u003e\n\u003cstrong\u003eWhich vehicles use the KA24DE engine?\u003c\/strong\u003e\n\u003cp\u003eThe KA24DE 2.4L DOHC engine was used in the 1991-1998 Nissan 240SX, the 2000-2004 Nissan Xterra, and the 1998-2004 Nissan Frontier.\u003c\/p\u003e\n\u003cstrong\u003eWhy are these guides oversize instead of stock size?\u003c\/strong\u003e\n\u003cp\u003eThe +0.02mm oversize accounts for the small amount of material removed when reaming out a worn or damaged factory guide bore, so the guide seats with proper interference fit after machining.\u003c\/p\u003e\n\u003cstrong\u003eCan I install these guides myself at home?\u003c\/strong\u003e\n\u003cp\u003eNo. Valve guide replacement requires pressing out the old guides, reaming the head bore to the correct oversize dimension, and pressing in the new guides with a machine shop press and precision reamers. This is a machine shop job, not a driveway repair.\u003c\/p\u003e\n\u003cstrong\u003eDo I need new valves with this valve guide set?\u003c\/strong\u003e\n\u003cp\u003eNot strictly, but Supertech designs these guides to pair with their own low friction black nitride valves for the best combination of oil control and reduced stem wear. Reusing worn factory valves against new guides can shorten the life of the guides.\u003c\/p\u003e\n\u003cstrong\u003eAre these guides for intake only, exhaust only, or both?\u003c\/strong\u003e\n\u003cp\u003eThis set includes both, 4 intake and 4 exhaust guides, enough for a complete KA24DE cylinder head.\u003c\/p\u003e\n\u003cstrong\u003eWhat material are these valve guides made from?\u003c\/strong\u003e\n\u003cp\u003eManganese bronze, chosen for its wear resistance and heat dissipation properties compared to cast iron factory guides.\u003c\/p\u003e\n\u003cstrong\u003eWill this fit a KA24E SOHC engine?\u003c\/strong\u003e\n\u003cp\u003eNo. This guide set is machined specifically for the KA24DE DOHC 16-valve head. The earlier KA24E SOHC engine uses a different valve guide configuration.\u003c\/p\u003e\n\u003ch4\u003eInstall Instructions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eRemove the cylinder head and fully disassemble the valvetrain\u003c\/li\u003e\n\u003cli\u003ePress out the worn factory valve guides using a machine shop press\u003c\/li\u003e\n\u003cli\u003eReam the guide bores to the correct oversize dimension for a proper interference fit\u003c\/li\u003e\n\u003cli\u003ePress in the new Supertech manganese bronze guides squarely and to the correct depth\u003c\/li\u003e\n\u003cli\u003eReam or hone the new guides to final bore size for correct valve stem clearance\u003c\/li\u003e\n\u003cli\u003eRe-cut valve seats as needed and reassemble the valvetrain with new seals\u003c\/li\u003e\n\u003c\/ol\u003e\n","brand":"Supertech","offers":[{"title":"Default Title","offer_id":46179439902799,"sku":"SPTGDE-NKA24-7-EI-OS-8","price":75.83,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/supertech-ka24-manganese-bronze-valve-guides-set-of-8.png?v=1784916232","url":"https:\/\/www.blackopsautoworks.com\/products\/supertech-gde-nka24-7-ei-os-8-valve-guides-240sx-xterra-frontier","provider":"Black Ops Auto Works","version":"1.0","type":"link"}