{"product_id":"supertech-valves-black-nitride-3000gt","title":"Supertech Black Nitride Intake Valves for 6G72 3000GT","description":"Supertech black nitride intake and exhaust valves for 6G72 3000GT and Stealth. These valves are available in various sizes to match your head diameter. Sold as a set of 12 or individually as needed. Please do all your research and consult your engine builder if necessary! Black nitride valves are made from one piece forged stainless steel then go through a special hardening process to lessen the friction between the valve and guide.\u003cbr\u003e\u003cbr\u003e\u003cspan style=\"color: #ff2a00;\"\u003eVehicle Fitment:\u003c\/span\u003e\u003cbr\u003e 1991-1999 3000GT VR-4\u003cbr\u003e 1991-1996 Stealth R\/T\u003cbr\u003e\u003cbr\u003e\n\u003cdiv style=\"overflow-x: auto;\"\u003e\n\u003ctable cellspacing=\"0\" cellpadding=\"0\" border=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr bgcolor=\"2d2d2d\"\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eFitment:\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eSize:\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eIncludes:\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003ePart Number:\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"404040\"\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003eExhaust\u003cbr\u003e*Discontinued*\u003c\/td\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003e+.5mm Oversize 31.00mm\u003cbr\u003e • Stem Diameter 6.57mm\u003cbr\u003e • Length 106.35mm\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e12 Valves\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eMEVN-1011-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"404040\"\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e1 Valve\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eMEVN-1011-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"2d2d2d\"\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003eExhaust\u003cbr\u003e*Discontinued*\u003c\/td\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003e+2mm Oversize 32.50mm\u003cbr\u003e • Stem Diameter 6.57mm\u003cbr\u003e • Length 106.35mm\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e12 Valves\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eMEVN-1013-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"2d2d2d\"\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e1 Valve\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eMEVN-1013-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"404040\"\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003eIntake\u003c\/td\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003e+1mm Oversize 36.00mm\u003cbr\u003e • Stem Diameter 6.54mm\u003cbr\u003e • Length 105.5mm\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e12 Valves\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eMIVN-1012-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"404040\"\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e1 Valve\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eMIVN-1012-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\nThe \"Black Nitride\" is a hardening treatment that is applied to the whole valve whereas the chrome coating is only applied to the stem. The microhardness is higher than the stainless steel base material, keeping good ductility beneath the hard nitrided layer. Microhardness is 800HV minimum.\u003cbr\u003e\u003cbr\u003e The Black Nitride surface finish is smoother than with chromed stems, having less friction between stem and guide. The higher the engine speed the bigger the power loss due to internal engine friction! The Black Nitride reduces this power loss due to less valve-guide friction.\u003cbr\u003e\u003cbr\u003eImages are for reference.\u003cbr\u003e\u003cbr\u003e \u003cspan style=\"color: #ff2a00;\"\u003eNotes:\u003c\/span\u003e\u003cbr\u003eUnfortunately the exhaust valves were discontinued by Supertech in November 2023. We have none remaining in stock.\u003cbr\u003e \u003ca href=\"https:\/\/stmtuned.com\/collections\/supertech-products\" style=\"color: #afafaf;\"\u003e\u003cbr\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: .8em;\"\u003e See more Supertech Parts\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/a\u003e","brand":"Supertech","offers":[{"title":"Intake 36.00mm (Set of 12) (MIVN-1012-12)","offer_id":50562355134806,"sku":"SUP-MIVN-1012-12","price":300.7,"currency_code":"EUR","in_stock":true},{"title":"Intake 36.00mm (1 Single) (MIVN-1012-1)","offer_id":50562355167574,"sku":"SUP-MIVN-1012-1","price":43.82,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/9531\/8102\/files\/supertech-valves-black-nitride-3000gt-set-of-12.jpg?v=1749201440","url":"https:\/\/www.speed-addicts.com\/en\/products\/supertech-valves-black-nitride-3000gt","provider":"Speed Addicts","version":"1.0","type":"link"}