{"product_id":"manley-chevy-ls-3-l-99-small-block-severe-duty-exhaust-valves-set-of-8","title":"Manley Chevy LS-3\/L-99 Small Block Severe Duty Exhaust Valves (Set of 8)","description":"\u003cp\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e \u003cspan itemprop=\"sku\"\u003e11661-8\u003c\/span\u003e | \u003cstrong\u003eUPC:\u003c\/strong\u003e 807298051451\u003c\/p\u003e\n\n\u003ch4\u003e\u003cstrong\u003eManley Chevy LS-3\/L-99 Small Block Severe Duty Exhaust Valves (Set of 8) 2008-2015 Corvette Camaro CTS-V\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eManley Severe Duty Exhaust Valves deliver reliable power in high-performance Chevy LS3 and L99 small block engines. This set of 8 fits rectangular port cylinder heads on 2008-2015 Corvette Camaro SS CTS-V and similar GM vehicles. XH-428 material construction handles racing heat and stress for consistent exhaust flow.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eXH-428 Material:\u003c\/strong\u003e Heat-resistant stainless alloy maintains strength at exhaust gas temperatures over 1600°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Dimensions:\u003c\/strong\u003e 1.600 inch head diameter 5.000 inch overall length 8mm stem diameter for precise LS3\/L99 fit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwirl Polished Heads:\u003c\/strong\u003e Improves airflow reduces valve weight enhances high-RPM efficiency\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChrome-Faced Tip:\u003c\/strong\u003e Increases wear resistance extends valve life in aggressive valvetrain setups\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-Angle Seat Cut:\u003c\/strong\u003e 0.313 inch width ensures tight seal supports high compression builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eProduct Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSet includes 8 exhaust valves for complete cylinder head refresh\u003c\/li\u003e\n\u003cli\u003eMatch with beehive or dual valve springs rated for 8000+ RPM\u003c\/li\u003e\n\u003cli\u003eHandle with care valves arrive in protective plastic sleeves\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eProfessional installation recommended.\u003c\/li\u003e\n\u003cli\u003eVerify installed height and spring pressures during assembly\u003c\/li\u003e\n\u003cli\u003eWorks with OEM or aftermarket titanium retainers and 10-degree locks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eThis Part Fits\u003c\/h4\u003e\n\u003ctable border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eYear\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eSubmodel\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2008-2013\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eCorvette\u003c\/td\u003e\n\u003ctd\u003eBase\/Grand Sport LS3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2010-2015\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eCamaro\u003c\/td\u003e\n\u003ctd\u003eSS LS3\/L99\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2012-2015\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eCamaro\u003c\/td\u003e\n\u003ctd\u003eZL1 LSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2009-2015\u003c\/td\u003e\n\u003ctd\u003eCadillac\u003c\/td\u003e\n\u003ctd\u003eCTS-V\u003c\/td\u003e\n\u003ctd\u003eLSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2014-2017\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSS\u003c\/td\u003e\n\u003ctd\u003eLT1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eWhy Choose Manley?\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eDecades of experience supplying valves to professional racing teams\u003c\/li\u003e\n\u003cli\u003eForged one-piece design withstands 10000+ RPM operation\u003c\/li\u003e\n\u003cli\u003eCNC machined tolerances hold under extreme cylinder pressures\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e Do these fit LS2 cathedral port heads?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e No these are sized for LS3\/L99 rectangular port heads LS2 requires different valve dimensions\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What makes XH-428 material suitable for exhaust valves?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e XH-428 offers high nickel content for corrosion resistance and thermal stability in hot exhaust environments\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e Is machining or special valvetrain parts needed?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e Drop-in replacement for stock LS3\/L99 seats guides use stock-length pushrods with proper spring combo\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eShipping \u0026amp; Handling\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMethod:\u003c\/strong\u003e UPS Ground\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailability:\u003c\/strong\u003e Special order ships within 3-5 business days\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Secure foam-lined cardboard box 6.2 x 5.4 x 1.3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.05 lbs\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":40530579652687,"sku":"MAN11661-8","price":301.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/manley-chevy-ls-3l-99-small-block-severe-duty-exhaust-valves-set-of-8-manley-performance.jpg?v=1772547380","url":"https:\/\/www.blackopsautoworks.com\/products\/manley-chevy-ls-3-l-99-small-block-severe-duty-exhaust-valves-set-of-8","provider":"Black Ops Auto Works","version":"1.0","type":"link"}