{"product_id":"manley-chevy-lt-1-1-590-head-diameter-pro-flo-exhaust-valves-set-of-8","title":"Manley Chevy LT-1 1.590 Head Diameter Pro Flo Exhaust Valves (Set of 8)","description":"\u003cp\u003eThe Manley Performance engine valve identified by manufacturer part number 12349-8 is engineered for a measured performance-engine assembly. Final compatibility depends on the exact engine, mating components, and verified dimensions, not a similar product title alone.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExact Manley manufacturer part number\u003c\/li\u003e\n\u003cli\u003eCritical application and dimensional details organized for verification\u003c\/li\u003e\n\u003cli\u003eDesigned for measured performance-engine assembly\u003c\/li\u003e\n\u003cli\u003eRequires final machining, clearance, and compatibility checks\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/p\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eFitment Status\u003c\/th\u003e\n\u003ctd\u003eEngine and build verification required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRequired Verification\u003c\/th\u003e\n\u003ctd\u003eExact engine code, dimensions, mating components, material, intended power level, and current Manley application listing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eManley Performance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e12349-8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eEngine Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFitment Type\u003c\/th\u003e\n\u003ctd\u003eFitment Verification Required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCondition\u003c\/th\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eWhat's Included\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOne new Manley Performance engine valve in the exact quantity and configuration stated in the specifications. Bearings, rings, pins, locks, fasteners, and installation hardware are included only when expressly listed for this part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAbout Manley Performance\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eManley Performance engineers connecting rods, pistons, crankshafts, valves, valvetrain components, and related hardware for professional street, racing, and forced-induction engine builds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eRelated Manley Performance Products\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-ca\/collections\/manley-performance\"\u003eShop all Manley Performance products\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ca\/products\/manley-chevy-lt-1-6-2l-1-590in-head-diameter-pro-flo-severe-duty-exhaust-valves-set-of-8\"\u003eManley Chevy LT-1 6.2L 1.590in Head Diameter Pro Flo\/Severe Duty Exhaust Valves (Set of 8)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ca\/products\/manley-small-block-chevy-ls-1-ls-2-ls-6-head-1-550-head-diameter-race-flo-exhaust-valves\"\u003eManley Small Block Chevy LS-1 \/ LS-2 (LS-6 Head) 1.550 Head Diameter Race Flo Exhaust Valves\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ca\/products\/manley-chevrolet-lt1-6-2l-1-590in-head-diameter-race-master-exhaust-valves-set-of-8\"\u003eManley Chevrolet LT1 6.2L 1.590in Head Diameter Race Master Exhaust Valves (Set of 8)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I verify the application for Manley 12349-8?\u003c\/strong\u003e\u003cbr\u003eMatch the exact Manley part number and engine code, then confirm every listed dimension, material, mating component, clearance, and intended power level before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat specifications must match for this engine valve?\u003c\/strong\u003e\u003cbr\u003eConfirm every listed dimension, material, quantity, engine interface, mating component, and current Manley application note. Similar-looking engine components are not automatically interchangeable.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs professional installation recommended?\u003c\/strong\u003e\u003cbr\u003eYes. A qualified engine builder should inspect the component, measure the engine and mating parts, verify all clearances, and follow current Manley and engine-manufacturer procedures.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstallation Instructions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eUse the current Manley instructions for part number 12349-8 and the engine builder's measured assembly specifications. Verify material, orientation, machining, clearances, fastener procedure, lubrication, balance, torque or stretch values, and break-in before operation.\u003c\/p\u003e","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":41508235640911,"sku":"MAN12349-8","price":514.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/manley-performance-man12349-8-engine-valve-image-01.jpg?v=1788776100","url":"https:\/\/www.blackopsautoworks.com\/en-ca\/products\/manley-chevy-lt-1-1-590-head-diameter-pro-flo-exhaust-valves-set-of-8","provider":"Black Ops Auto Works","version":"1.0","type":"link"}