{"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","url":"https:\/\/smgspeed.com\/products\/mangum-racing-273cc-ls7-cylinder-heads","provider":"SMGspeed","version":"1.0","type":"link"}