{"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\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eMangum Racing Stage 1 Ported 243\/799 LS6 Cylinder Heads\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eare designed to transform proven GM factory castings into a reliable, high-performance upgrade. Starting with carefully selected seasoned cores, each set features\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eCNC ported runners\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand a precision valve job for consistent airflow and long-term durability.\u003c\/p\u003e\n\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/summary\u003e\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCNC ported intake and exhaust runners\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePrecision CNC valve job\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFully assembled and ready to run\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePAC Racing dual valve springs\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewith titanium retainers\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eStock GM valves\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHand-finished and assembled in-house\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eAirflow Performance\u003c\/strong\u003e\u003c\/summary\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e.200” – 145 CFM | .300” – 206 CFM | .400” – 256 CFM | .500” – 293 CFM | .600” – 309 CFM | .650” – 311 CFM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e.200” – 117 CFM | .300” – 155 CFM | .400” – 195 CFM | .500” – 212 CFM | .600” – 228 CFM | .650” – 230 CFM\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eConstruction Details\u003c\/strong\u003e\u003c\/summary\u003e\u003cul\u003e\n\u003cli\u003eSeasoned GM\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e243\/799 castings\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e228cc CNC intake ports\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e62.5cc CNC combustion chambers\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2.00” intake \/ 1.55” exhaust valves\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePAC dual spring package\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e15° valve angle\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewith factory guides\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/summary\u003e\u003cul\u003e\n\u003cli\u003eMinimum bore:\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3.780”\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCompatible with\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e4.8L, 5.3L, 5.7L, 6.0L LS engines and larger\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIdeal for\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ecamshaft upgrades, class racing applications, or improving reliability\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eon LS engines, these heads offer proven performance while retaining factory-style castings.\u003c\/p\u003e\u003c\/details\u003e","brand":"Mangum Racing","offers":[{"title":"Default Title","offer_id":52550872531220,"sku":null,"price":1499.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/8434\/8180\/files\/Stage1LS6.1.jpg?v=1779915658","url":"https:\/\/mangumracing.com\/products\/mangum-racing-stage-1-ported-243-799-ls6-cylinder-heads","provider":"Mangum Racing CNC Ported Cylinder Heads","version":"1.0","type":"link"}