{"product_id":"chevy-ls1-ls6-assembled-aluminum-cylinder-head","title":"Chevy LS1, LS6 Assembled Aluminum Cylinder Head","description":"\u003cp\u003eUpgrade your GM LS with assembled aluminum cylinder heads engineered to improve airflow, combustion efficiency, and horsepower potential. Featuring 210 cc intake runners, 64 cc combustion chambers, 2.000 in. intake \/ 1.550 in. exhaust valves, 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\u003eImproved Airflow \u0026amp; Power Potential\u003c\/strong\u003e\u003cbr\u003eOptimized runner and chamber design helps move more air through the engine, improving throttle response, torque, and top-end horsepower potential across the RPM range.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAssembled Valve Train Setup\u003c\/strong\u003e\u003cbr\u003eDelivered assembled with matched valves, springs, retainers, locks, and seals where specified, helping simplify installation for performance camshaft applications.\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: Yes\u003cbr\u003eCNC Ported: No\u003cbr\u003eCombustion Chamber Style: Heart\u003cbr\u003eCombustion Chamber Volume: 64 cc\u003cbr\u003eDeck Height: Standard\u003cbr\u003eDeck Thickness: Standard\u003cbr\u003eExhaust Crossover: No\u003cbr\u003eExhaust Port Location: Standard\u003cbr\u003eExhaust Port Shape: D-port\u003cbr\u003eExhaust Valve Diameter: 1.550 in.\u003cbr\u003eExhaust Valve Material: Stainless Steel\u003cbr\u003eFinish: Natural\u003cbr\u003eGrade Type: Performance\u003cbr\u003eIntake Port Location: Standard\u003cbr\u003eIntake Port Shape: Cathedral\u003cbr\u003eIntake Runner Volume: 210 cc\u003cbr\u003eIntake Valve Diameter: 2.000 in.\u003cbr\u003eIntake Valve Material: Stainless Steel\u003cbr\u003eMaterial: Aluminum\u003cbr\u003eQuantity: Sold Individually\u003cbr\u003eValve Guide Material: Bronze\u003cbr\u003eValve Seat Material: Steel\u003cbr\u003eValve Spring Maximum Lift: 0.660 in.\u003cbr\u003eValve Spring Retainer Material: Chromoly Steel\u003cbr\u003eValve Springs Included: No\u003cbr\u003eValves Included: Yes\u003c\/p\u003e","brand":"Top Street Performance","offers":[{"title":"Default Title","offer_id":51591853211944,"sku":"JM4520","price":660.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0901\/8356\/5608\/files\/JM4520-01.jpg?v=1777405433","url":"https:\/\/topstreetperformance.com\/products\/chevy-ls1-ls6-assembled-aluminum-cylinder-head","provider":"Top Street Performance","version":"1.0","type":"link"}