{"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\/products\/mangum-racing-stage-1-ported-243-799-ls6-cylinder-heads","provider":"SMGspeed","version":"1.0","type":"link"}