{"title":"Mangum Racing","description":null,"products":[{"product_id":"mangum-racing-273cc-ls7-cylinder-heads","title":"Mangum Racing 273cc LS7 Cylinder Heads","description":"\u003cp\u003eBuilt for high-output LS7 combinations, these fully CNC-ported cylinder heads combine a 273cc intake runner and 93cc exhaust port with a 12° valve angle, OEM LS7 valve spacing, and stock intake and exhaust port locations. The 6-bolt design is suited to serious naturally aspirated and boosted street\/strip builds.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e6-bolt LS7 casting with OEM LS7 valve spacing and center-bolt valve cover pattern\u003c\/li\u003e\n\u003cli\u003e273cc CNC intake ports, 93cc exhaust ports, and 70.5cc combustion chambers\u003c\/li\u003e\n\u003cli\u003e2.200\" titanium intake valves and 1.610\" stainless exhaust valves\u003c\/li\u003e\n\u003cli\u003eBronze guides, PAC .660\" dual springs, titanium retainers, Viton seals, and 1.250\" steel spring seats\u003c\/li\u003e\n\u003cli\u003eMinimum bore: 4.100\"; flat milling available at .006\" per cc\u003c\/li\u003e\n\u003cli\u003eOE- or LS-style 6-bolt head fastener compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eAirflow Performance\u003c\/h3\u003e\u003cp\u003eSuperFlow SF-1020 data with a 4.125\" bore plate; intake uses a radius entry and exhaust is tested without a pipe.\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eValve Lift\u003c\/th\u003e\n\u003cth\u003e.200\u003c\/th\u003e\n\u003cth\u003e.300\u003c\/th\u003e\n\u003cth\u003e.400\u003c\/th\u003e\n\u003cth\u003e.500\u003c\/th\u003e\n\u003cth\u003e.600\u003c\/th\u003e\n\u003cth\u003e.700\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eIntake CFM\u003c\/th\u003e\n\u003ctd\u003e160\u003c\/td\u003e\n\u003ctd\u003e255\u003c\/td\u003e\n\u003ctd\u003e313\u003c\/td\u003e\n\u003ctd\u003e355\u003c\/td\u003e\n\u003ctd\u003e382\u003c\/td\u003e\n\u003ctd\u003e393\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExhaust CFM\u003c\/th\u003e\n\u003ctd\u003e117\u003c\/td\u003e\n\u003ctd\u003e160\u003c\/td\u003e\n\u003ctd\u003e209\u003c\/td\u003e\n\u003ctd\u003e224\u003c\/td\u003e\n\u003ctd\u003e235\u003c\/td\u003e\n\u003ctd\u003e247\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eInstallation note:\u003c\/strong\u003e Measure pushrod length for the final camshaft, gasket, and chamber-milling combination.\u003c\/p\u003e","brand":"Mangum Racing","offers":[{"title":"Default Title","offer_id":54111764709695,"sku":"MR-273LS7","price":3299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0760\/2041\/6831\/files\/mangum-racing-mr-273ls7_a5caea44-a088-4a82-a2ce-95bd44566101.webp?v=1784146857"},{"product_id":"mangum-racing-brodix-273cc-ls7-cylinder-heads","title":"Mangum Racing Brodix 273cc LS7 Cylinder Heads","description":"\u003cp\u003eBased on the race-proven Brodix LS7 casting, this Mangum Racing 273cc program is built for large-displacement, high-rpm LS7 combinations. Full CNC machining, a 12° valve angle, OEM LS7 valve spacing, and a 6-bolt deck deliver airflow and structural strength for demanding naturally aspirated or boosted applications.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e6-bolt Brodix LS7 casting with stock valve lengths and OEM LS7 valve spacing\u003c\/li\u003e\n\u003cli\u003e273cc CNC intake ports, 93cc exhaust ports, and 70.5cc CNC combustion chambers\u003c\/li\u003e\n\u003cli\u003e2.200\" titanium intake valves and 1.610\" stainless exhaust valves\u003c\/li\u003e\n\u003cli\u003eBronze guides, PAC .660\" dual springs, titanium retainers, Viton seals, and 1.250\" steel spring seats\u003c\/li\u003e\n\u003cli\u003eChamber softening and flat milling at .006\" per cc available\u003c\/li\u003e\n\u003cli\u003eMinimum bore: 4.100\"\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eAirflow Performance\u003c\/h3\u003e\u003cp\u003eSuperFlow 1020 data with a 4.125\" bore plate; intake uses a radius entry and exhaust is tested without a pipe.\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eValve Lift\u003c\/th\u003e\n\u003cth\u003e.200\u003c\/th\u003e\n\u003cth\u003e.300\u003c\/th\u003e\n\u003cth\u003e.400\u003c\/th\u003e\n\u003cth\u003e.500\u003c\/th\u003e\n\u003cth\u003e.600\u003c\/th\u003e\n\u003cth\u003e.700\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eIntake CFM\u003c\/th\u003e\n\u003ctd\u003e160\u003c\/td\u003e\n\u003ctd\u003e255\u003c\/td\u003e\n\u003ctd\u003e313\u003c\/td\u003e\n\u003ctd\u003e355\u003c\/td\u003e\n\u003ctd\u003e382\u003c\/td\u003e\n\u003ctd\u003e393\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExhaust CFM\u003c\/th\u003e\n\u003ctd\u003e117\u003c\/td\u003e\n\u003ctd\u003e160\u003c\/td\u003e\n\u003ctd\u003e209\u003c\/td\u003e\n\u003ctd\u003e224\u003c\/td\u003e\n\u003ctd\u003e235\u003c\/td\u003e\n\u003ctd\u003e247\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eInstallation note:\u003c\/strong\u003e Stock pushrod length works in many combinations, but final length must be verified after camshaft selection and milling.\u003c\/p\u003e","brand":"Mangum Racing","offers":[{"title":"Default Title","offer_id":54111765135679,"sku":"MR-BR273LS7","price":3899.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0760\/2041\/6831\/files\/mangum-racing-mr-br273ls7_b24dc54f-d1cc-41a4-8af5-e98066b3c64f.webp?v=1784146884"},{"product_id":"mangum-racing-267cc-ls3-cylinder-heads","title":"Mangum Racing 267cc LS3 Cylinder Heads","description":"\u003cp\u003eThese Mangum Racing 267cc LS3 heads use a 6-bolt casting with increased deck thickness while retaining the OEM 15° valve angle and LS3 valve spacing. A 267cc CNC intake runner and 96cc exhaust port provide strong mid-lift response and stable high-lift flow for serious stock-geometry naturally aspirated and boosted combinations.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e6-bolt Mangum Racing LS3 casting with increased deck thickness\u003c\/li\u003e\n\u003cli\u003e15° valve angle with OEM LS3 valve spacing\u003c\/li\u003e\n\u003cli\u003e267cc CNC intake ports, 96cc exhaust ports, and 68.5cc CNC chambers\u003c\/li\u003e\n\u003cli\u003e2.165\" hollow-stem stainless intake valves and 1.600\" hollow-stem stainless exhaust valves\u003c\/li\u003e\n\u003cli\u003eBronze guides, PAC .660\" dual springs, titanium retainers, Viton seals, and 1.250\" steel spring seats\u003c\/li\u003e\n\u003cli\u003eChamber softening available for 4.000\", 4.065\", and 4.125\" bores; minimum bore 4.000\"\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eAirflow Performance\u003c\/h3\u003e\u003cp\u003eSuperFlow data with a 4.125\" bore plate; intake uses a radius entry and exhaust is tested without a pipe.\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eValve Lift\u003c\/th\u003e\n\u003cth\u003e.200\u003c\/th\u003e\n\u003cth\u003e.300\u003c\/th\u003e\n\u003cth\u003e.400\u003c\/th\u003e\n\u003cth\u003e.500\u003c\/th\u003e\n\u003cth\u003e.600\u003c\/th\u003e\n\u003cth\u003e.700\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eIntake CFM\u003c\/th\u003e\n\u003ctd\u003e148\u003c\/td\u003e\n\u003ctd\u003e227\u003c\/td\u003e\n\u003ctd\u003e282\u003c\/td\u003e\n\u003ctd\u003e325\u003c\/td\u003e\n\u003ctd\u003e350\u003c\/td\u003e\n\u003ctd\u003e363\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExhaust CFM\u003c\/th\u003e\n\u003ctd\u003e114\u003c\/td\u003e\n\u003ctd\u003e164\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e233\u003c\/td\u003e\n\u003ctd\u003e240\u003c\/td\u003e\n\u003ctd\u003e243\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eInstallation note:\u003c\/strong\u003e Verify pushrod length after selecting the camshaft, gasket thickness, and final chamber size.\u003c\/p\u003e","brand":"Mangum Racing","offers":[{"title":"Default Title","offer_id":54111765561663,"sku":"MR-267LS3","price":2099.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0760\/2041\/6831\/files\/mangum-racing-mr-267ls3_a0e7ab69-7bd1-4a67-81e3-7d6be43e20a3.webp?v=1784146844"},{"product_id":"mangum-racing-brodix-267cc-ls3-cylinder-heads","title":"Mangum Racing Brodix 267cc LS3 Cylinder Heads","description":"\u003cp\u003eBuilt from Brodix 6-bolt LS3 castings with additional deck thickness, these 267cc Mangum Racing heads retain the OEM 15° valve angle and LS3 valve locations. Full CNC porting and premium valvetrain hardware make them a strong choice for high-output street, strip, naturally aspirated, and boosted combinations that need stock geometry.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e6-bolt Brodix LS3 casting with increased deck thickness\u003c\/li\u003e\n\u003cli\u003e15° valve angle with OEM LS3 valve spacing\u003c\/li\u003e\n\u003cli\u003e267cc CNC intake ports, 96cc exhaust ports, and 68.5cc CNC chambers\u003c\/li\u003e\n\u003cli\u003e2.165\" hollow-stem stainless intake valves and 1.600\" hollow-stem stainless exhaust valves\u003c\/li\u003e\n\u003cli\u003eBronze guides, PAC .660\" dual springs, titanium retainers, Viton seals, and 1.250\" steel spring seats\u003c\/li\u003e\n\u003cli\u003eChamber softening available for 4.000\", 4.065\", and 4.125\" bores; minimum bore 4.000\"\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eAirflow Performance\u003c\/h3\u003e\u003cp\u003eSuperFlow data with a 4.125\" bore plate; intake uses a radius entry and exhaust is tested without a pipe.\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eValve Lift\u003c\/th\u003e\n\u003cth\u003e.200\u003c\/th\u003e\n\u003cth\u003e.300\u003c\/th\u003e\n\u003cth\u003e.400\u003c\/th\u003e\n\u003cth\u003e.500\u003c\/th\u003e\n\u003cth\u003e.600\u003c\/th\u003e\n\u003cth\u003e.700\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eIntake CFM\u003c\/th\u003e\n\u003ctd\u003e148\u003c\/td\u003e\n\u003ctd\u003e227\u003c\/td\u003e\n\u003ctd\u003e282\u003c\/td\u003e\n\u003ctd\u003e325\u003c\/td\u003e\n\u003ctd\u003e350\u003c\/td\u003e\n\u003ctd\u003e363\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExhaust CFM\u003c\/th\u003e\n\u003ctd\u003e114\u003c\/td\u003e\n\u003ctd\u003e164\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e233\u003c\/td\u003e\n\u003ctd\u003e240\u003c\/td\u003e\n\u003ctd\u003e243\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eInstallation note:\u003c\/strong\u003e Stock pushrod length works in many applications, but measure the final combination before assembly.\u003c\/p\u003e","brand":"Mangum Racing","offers":[{"title":"Default Title","offer_id":54111766020415,"sku":"MR-BR267LS3","price":2699.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0760\/2041\/6831\/files\/mangum-racing-mr-br267ls3_270b3561-cbb0-41aa-a42d-c56df3c50a24.webp?v=1784146879"},{"product_id":"mangum-racing-275cc-11-degree-ls3-cylinder-heads","title":"Mangum Racing 275cc 11-Degree LS3 Cylinder Heads","description":"\u003cp\u003eThe MR275 is a maximum-effort 11° LS3 cylinder head built around a Mangum Racing 6-bolt casting with a .750\" deck surface. Revised valve locations, a 275cc CNC intake runner, and a 98cc exhaust port are engineered for airflow, piston-to-valve clearance, and durability in high-compression or high-cylinder-pressure combinations.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e6-bolt Mangum Racing 11° LS3 casting with .750\" deck thickness\u003c\/li\u003e\n\u003cli\u003eOptimized valve locations with 275cc CNC intake ports and 98cc exhaust ports\u003c\/li\u003e\n\u003cli\u003e70.5cc fully CNC-machined combustion chambers\u003c\/li\u003e\n\u003cli\u003e2.185\" hollow-stem stainless extended-length intake valves and 1.600\" stainless extended-length exhaust valves\u003c\/li\u003e\n\u003cli\u003eChoice of PAC 1207X, 1208X, or 1209X dual springs with titanium retainers\u003c\/li\u003e\n\u003cli\u003eBronze guides, Viton seals, 1.250\" steel spring seats, and minimum 4.000\" bore\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eAirflow Performance\u003c\/h3\u003e\u003cp\u003eSuperFlow data with a 4.125\" bore plate; intake uses a radius entry and exhaust is tested without a pipe.\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eValve Lift\u003c\/th\u003e\n\u003cth\u003e.200\u003c\/th\u003e\n\u003cth\u003e.300\u003c\/th\u003e\n\u003cth\u003e.400\u003c\/th\u003e\n\u003cth\u003e.500\u003c\/th\u003e\n\u003cth\u003e.600\u003c\/th\u003e\n\u003cth\u003e.700\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eIntake CFM\u003c\/th\u003e\n\u003ctd\u003e143\u003c\/td\u003e\n\u003ctd\u003e221\u003c\/td\u003e\n\u003ctd\u003e283\u003c\/td\u003e\n\u003ctd\u003e330\u003c\/td\u003e\n\u003ctd\u003e358\u003c\/td\u003e\n\u003ctd\u003e381\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExhaust CFM\u003c\/th\u003e\n\u003ctd\u003e112\u003c\/td\u003e\n\u003ctd\u003e161\u003c\/td\u003e\n\u003ctd\u003e202\u003c\/td\u003e\n\u003ctd\u003e232\u003c\/td\u003e\n\u003ctd\u003e242\u003c\/td\u003e\n\u003ctd\u003e248\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eInstallation note:\u003c\/strong\u003e Extended-length valvetrain components require careful pushrod, rocker, and piston-to-valve clearance checks.\u003c\/p\u003e","brand":"Mangum Racing","offers":[{"title":"Default Title","offer_id":54111766479167,"sku":"MR-27511DLS3","price":2899.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0760\/2041\/6831\/files\/mangum-racing-mr-27511dls3_22199c35-160f-49f6-afd4-952f4225beb5.webp?v=1784146868"},{"product_id":"mangum-racing-stage-1-ported-243-799-ls6-cylinder-heads","title":"Mangum Racing Stage 1 Ported 243\/799 LS6 Cylinder Heads","description":"\u003cp\u003eMangum Racing Stage 1 243\/799 heads turn selected seasoned GM castings into a fully assembled performance upgrade. CNC-ported intake and exhaust runners, a precision CNC valve job, and upgraded spring hardware improve airflow and valvetrain control while retaining the familiar factory-style LS6 casting.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSelected GM 243 or 799 castings; the supplied core casting number may vary\u003c\/li\u003e\n\u003cli\u003e228cc CNC intake ports and 62.5cc CNC combustion chambers\u003c\/li\u003e\n\u003cli\u003eStock GM 2.00\" intake and 1.55\" exhaust valves\u003c\/li\u003e\n\u003cli\u003ePAC .660\" dual valve springs with titanium retainers\u003c\/li\u003e\n\u003cli\u003e15° valve angle with factory guides\u003c\/li\u003e\n\u003cli\u003eMinimum bore: 3.780\"; compatible with 4.8L, 5.3L, 5.7L, 6.0L, and larger LS combinations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eAirflow Performance\u003c\/h3\u003e\u003cp\u003eCurrent listing airflow data; intake and exhaust results are shown in CFM by valve lift.\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eValve Lift\u003c\/th\u003e\n\u003cth\u003e.200\u003c\/th\u003e\n\u003cth\u003e.300\u003c\/th\u003e\n\u003cth\u003e.400\u003c\/th\u003e\n\u003cth\u003e.500\u003c\/th\u003e\n\u003cth\u003e.600\u003c\/th\u003e\n\u003cth\u003e.650\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eIntake CFM\u003c\/th\u003e\n\u003ctd\u003e145\u003c\/td\u003e\n\u003ctd\u003e206\u003c\/td\u003e\n\u003ctd\u003e256\u003c\/td\u003e\n\u003ctd\u003e293\u003c\/td\u003e\n\u003ctd\u003e309\u003c\/td\u003e\n\u003ctd\u003e311\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExhaust CFM\u003c\/th\u003e\n\u003ctd\u003e117\u003c\/td\u003e\n\u003ctd\u003e155\u003c\/td\u003e\n\u003ctd\u003e195\u003c\/td\u003e\n\u003ctd\u003e212\u003c\/td\u003e\n\u003ctd\u003e228\u003c\/td\u003e\n\u003ctd\u003e230\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eInstallation note:\u003c\/strong\u003e Confirm chamber volume, piston-to-valve clearance, pushrod length, and spring compatibility for the selected camshaft.\u003c\/p\u003e","brand":"Mangum Racing","offers":[{"title":"Default Title","offer_id":54111766970687,"sku":"MR-LS6STG1","price":1499.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0760\/2041\/6831\/files\/mangum-racing-mr-ls6stg1_e5edc645-d800-4e0a-bc35-95a33112729d.webp?v=1784146891"}],"url":"https:\/\/smgspeed.com\/collections\/mangum-racing.oembed","provider":"SMGspeed","version":"1.0","type":"link"}