{"product_id":"chevy-ls1-ls6-cnc-ported-aluminum-cylinder-head","title":"Chevy LS1, LS6 CNC Ported Aluminum Cylinder Head","description":"\u003cp\u003eUpgrade your GM LS with bare aluminum cylinder heads engineered to improve airflow, combustion efficiency, and horsepower potential. Featuring 210cc intake runners, 64cc combustion chambers, these heads are built for street, strip, and performance engine builds that need better breathing than stock castings.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCNC-Ported Airflow\u003c\/strong\u003e\u003cbr\u003eCNC-ported intake and exhaust runners improve airflow consistency from port to port, supporting stronger horsepower potential and more predictable performance in upgraded engine combinations.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBare Head Build Flexibility\u003c\/strong\u003e\u003cbr\u003eBare cylinder head configuration gives builders the flexibility to select valves, springs, retainers, and hardware matched to the exact camshaft, RPM range, and power goal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAluminum Construction\u003c\/strong\u003e\u003cbr\u003eLightweight aluminum construction reduces weight compared to factory iron heads while improving heat dissipation for more consistent performance under demanding conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBuilt for Street \u0026amp; Performance Builds\u003c\/strong\u003e\u003cbr\u003eIdeal for performance rebuilds, restorations, and upgraded engine combinations. Always verify piston-to-valve clearance, camshaft compatibility, intake manifold fit, and header clearance before final installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCOMPATIBLE WITH\u003c\/strong\u003e\u003cbr\u003eGM LS SERIES V8 ENGINES - CATHEDRAL PORT\u003cbr\u003e• 4.8L \/ 293 in³ (LR4, LY2)\u003cbr\u003e• 5.3L \/ 325 in³ (LM7, L59, L33, LC9, LH6, LY5)\u003cbr\u003e• 5.7L \/ 346 in³ (LS1, LS6)\u003cbr\u003e• 6.0L \/ 364 in³ (LQ4, LQ9, LY6 with cathedral-port setup)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCOMMON VEHICLE APPLICATIONS\u003c\/strong\u003e\u003cbr\u003eChevrolet Corvette (LS1 \/ LS6 equipped)\u003cbr\u003eChevrolet Camaro \/ Pontiac Firebird (LS1 equipped)\u003cbr\u003ePontiac GTO (LS1 \/ LS2 equipped with compatible setup)\u003cbr\u003eGM Silverado \/ Sierra \/ SUV LS-based swaps\u003cbr\u003ePopular LS swap applications using cathedral-port intake manifolds\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNOTES\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDesigned for cathedral-port LS intake manifold applications.\u003c\/p\u003e\n\u003cp\u003eVerify intake manifold, rocker arm, valve cover, head gasket bore, and head bolt\/stud compatibility before installation.\u003c\/p\u003e\n\u003cp\u003eCylinder head sold individually (purchase quantity of 2 required for complete engine).\u003c\/p\u003e\n\u003cp\u003eNot compatible with rectangular-port LS3\/L92-style intake manifolds, Gen V LT direct-injection engines, Gen I SBC, or Big Block Chevy engines.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSPECIFICATIONS\u003c\/strong\u003e\u003cbr\u003eAssembled: No\u003cbr\u003eCombustion Chamber Style: Heart\u003cbr\u003eCombustion Chamber Volume: 64 cc\u003cbr\u003eCylinder Head Finish: Natural\u003cbr\u003eCylinder Head Material: Aluminum\u003cbr\u003eExhaust Port Location: Standard\u003cbr\u003eExhaust Port Shape: D-port\u003cbr\u003eIntake Port Location: Standard\u003cbr\u003eIntake Port Shape: Cathedral\u003cbr\u003eIntake Runner: 210 cc\u003cbr\u003eQuantity: Sold Individually\u003cbr\u003eValve Guide Material: Bronze\u003c\/p\u003e","brand":"Top Street Performance","offers":[{"title":"Default Title","offer_id":49818407174440,"sku":"JM4530","price":1480.25,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0901\/8356\/5608\/files\/JM4530_001_b2ac18ae-3872-489e-bb32-e9fc1a0affe4.jpg?v=1739807249","url":"https:\/\/www.topstreetperformance.com\/products\/chevy-ls1-ls6-cnc-ported-aluminum-cylinder-head","provider":"Top Street Performance","version":"1.0","type":"link"}