{"title":"LS1 Heads","description":"\u003cdiv class=\"firstpage-custom-collection\"\u003e\n\u003cdiv class=\"content-container\"\u003e\n\u003ch2\u003ePorted LS1 Heads\u003c\/h2\u003e\n\u003cp\u003eIf you're chasing serious performance gains from your LS1-powered vehicle, you're in the right place. At Australia Speed, we don’t just sell \u003cstrong\u003eLS1 heads\u003c\/strong\u003e — we specialise in CNC-ported \u003cstrong\u003eLS1 heads \u003c\/strong\u003eengineered to deliver unmatched airflow, throttle response, and horsepower. Whether you're prepping a street-legal racer or refreshing an aging engine, our precision-machined CNC heads are designed to outperform stock and hand-ported alternatives. For enthusiasts who want more than bolt-on power, \u003cstrong\u003eLS1 CNC heads\u003c\/strong\u003e offer the reliability and consistency your build demands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cinput id=\"check_id\" type=\"checkbox\"\u003e\u003clabel for=\"check_id\"\u003e\u003c\/label\u003e\u003cdiv class=\"content\"\u003e\u003cdiv\u003e\n\u003ch2\u003eWhat Are LS1 Heads?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eLS1 heads\u003c\/strong\u003e refer to the aluminium cylinder heads used in GM’s LS1 V8 — a platform celebrated for its power potential. These heads play a key role in how effectively your engine breathes, impacting both torque and top-end power.\u003c\/p\u003e\n\u003cp\u003eWhile stock \u003cstrong\u003eLS1 heads\u003c\/strong\u003e perform well, serious gains come from CNC porting — a process that digitally sculpts the intake and exhaust ports for maximum airflow and combustion efficiency. Our \u003cstrong\u003eCNC-ported LS1 heads\u003c\/strong\u003e are precisely machined to tight tolerances, unlocking horsepower and throttle sharpness that standard or hand-ported heads can't match\u003c\/p\u003e\n\u003ch2\u003eWhy Enthusiasts Choose Ported LS1 Heads\u003c\/h2\u003e\n\u003cp\u003eWhen stock isn't enough, CNC porting eliminates airflow restrictions, improves fuel atomisation, and delivers a noticeable upgrade across the rev range.\u003c\/p\u003e\n\u003cp\u003eBuilders choose our \u003cstrong\u003eCNC-ported LS1 heads\u003c\/strong\u003e for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eProven gains in horsepower and torque\u003c\/li\u003e\n\u003cli\u003eEnhanced drivability and throttle response\u003c\/li\u003e\n\u003cli\u003eA reliable performance foundation for camshaft, intake, or exhaust upgrades\u003c\/li\u003e\n\u003cli\u003eConsistent results you can depend on — on the street or at the track\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eExplore Our LS1 CNC Heads\u003c\/h2\u003eAustralia Speed proudly offers \u003cstrong\u003eLS1 CNC heads\u003c\/strong\u003e made for consistent, repeatable performance. CNC porting ensures each cylinder head is machined to exact specifications, reducing inconsistencies that may be found in hand-ported heads.\u003cp\u003eBenefits of \u003cstrong\u003eLS1 CNC Heads\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMaximised airflow for enhanced engine breathing\u003c\/li\u003e\n\u003cli\u003eImproved fuel combustion and burn efficiency\u003c\/li\u003e\n\u003cli\u003ePrecision-matched chambers for performance reliability\u003c\/li\u003e\n\u003cli\u003eDurable construction for track and street use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAustralia's Trusted Source for LS1 Heads\u003c\/h2\u003eWhen it comes to performance LS1 heads for sale, Australia Speed is a trusted name among mechanics, racers, and car enthusiasts nationwide. Our team brings years of technical knowledge and tuning experience to every product we offer.\u003cp\u003eWhy buy from Australia Speed?\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePremium Australian-made CNC ported heads\u003c\/li\u003e\n\u003cli\u003eLocal shipping and responsive customer service\u003c\/li\u003e\n\u003cli\u003eProven track record of performance and reliability\u003c\/li\u003e\n\u003cli\u003eAccess to expert advice and recommendations\u003c\/li\u003e\n\u003c\/ul\u003eYou’ll also find our collection extends beyond LS1 components—explore \u003ca href=\"https:\/\/australiaspeed.com.au\/cnc-shop-service\/cnc-heads\/chev\/ls2\/\"\u003eLS2 heads\u003c\/a\u003e and \u003ca href=\"https:\/\/australiaspeed.com.au\/cnc-shop-service\/cnc-heads\/chev\/ls3\/\"\u003eLS3 heads\u003c\/a\u003e to compare your options or future-proof your build.\u003ch3\u003eLS1 Heads \u0026amp; Supporting Components\u003c\/h3\u003e\n\u003cp\u003eWhile heads are a huge part of the equation, supporting mods are essential to getting the most from your build. Consider pairing your new ported LS1 heads with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA camshaft upgrade\u003c\/li\u003e\n\u003cli\u003eHigh-performance intake and exhaust systems\u003c\/li\u003e\n\u003cli\u003eMatching \u003ca href=\"https:\/\/australiaspeed.com.au\/asp-ls1-piston-kit\/\"\u003eLS1 piston rings\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDon’t forget to explore our full range of \u003ca href=\"https:\/\/australiaspeed.com.au\/\"\u003eperformance car parts\u003c\/a\u003e to support your engine goals.\u003c\/p\u003e\n\u003ch2\u003eReady to Elevate Your LS1’s Performance?\u003c\/h2\u003e\n\u003cp\u003eWhether you’re starting a fresh LS1 build or refining an existing setup, Australia Speed has you covered. Our CNC ported offerings give you the performance boost you’re after while ensuring long-term reliability.\u003c\/p\u003e\n\u003cp\u003eExplore our full range of LS1 CNC heads today and bring your engine to life with quality you can count on. Experience the Australia Speed difference—precision, reliability, and power with every product.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e","products":[{"product_id":"gmm-cnc-ported-ls1-241-heads-valves-pair-change-over-free-cam","title":"GMM CNC Ported LS1 (241) Heads \u0026 Valves - Pair - \"Change Over\"","description":"\u003cp\u003e1 Pair of Complete GMM CNC Ported LS1 (241) Heads and Valves - \"Change Over\"\u003c\/p\u003e\u003cp\u003eWhat you get\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCNC ported intake and exhaust port\u003c\/li\u003e\n\u003cli\u003eultra sonic process\u003c\/li\u003e\n\u003cli\u003e16 valves ground\u003c\/li\u003e\n\u003cli\u003e8 intake valve seats turned on Newen cnc cutter Multiple angle variable shape\u003c\/li\u003e\n\u003cli\u003e8 Exhaust valve seats turned on Newen cnc cutter Multiple angle variable shape\u003c\/li\u003e\n\u003cli\u003eincreased compression ratio with deck face machined. \u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003e5.7Lt Engine (Cathedral)\u003c\/strong\u003e\u003cp\u003e\u003cspan\u003e-Turbo Killer Camshaft - Use \u003c\/span\u003e\u003cstrong\u003e0.010\u003c\/strong\u003e\u003cspan\u003e Milled Head\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003e-Street Racer Camshaft - Use \u003c\/span\u003e\u003cstrong\u003e0.020\u003c\/strong\u003e\u003cspan\u003e Milled Head\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003e-Super Stock, Stealth, Torque Master Camshafts - Use \u003c\/span\u003e\u003cstrong\u003e0.030\u003c\/strong\u003e\u003cspan\u003e Milled Head\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003e-Super Stock Camshaft \u003c\/span\u003e\u003cstrong\u003e0.040\u003c\/strong\u003e\u003cspan\u003e If Requested\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/www.gmmotorsport.info\/cncheads\"\u003eClick here for more information on our CNC heads\u003c\/a\u003e\u003c\/p\u003e\u003cp\u003e\u003ciframe src=\"\/\/www.youtube.com\/embed\/4bR_yOn0P6A\" width=\"560\" height=\"314\" allowfullscreen=\"allowfullscreen\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\u003cp\u003e\u003ciframe src=\"\/\/www.youtube.com\/embed\/Qz1K8xyB8z0?t=167s\" width=\"560\" height=\"314\" allowfullscreen=\"allowfullscreen\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\u003cp\u003eIf you are looking for that extra edge or, more precisely, added power, then CNC technology will give you the results you need.\u003c\/p\u003e\u003cp\u003eIn fact, the cylinder head is one of the most, if not the most, important facets of engine horsepower.\u003c\/p\u003e\u003cp\u003eGMM Racing Heads have been supplying cylinder heads to major race teams \u003c\/p\u003e\u003cp\u003eThey have led the industry by providing superior performance cylinder heads to a broad cross-section of the racing world.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp class=\"box_spacer10\"\u003e\u003cspan\u003e\u003cstrong\u003eUpgrade Options\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp class=\"box_spacer10\"\u003e\u003cstrong\u003eDecking:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePlease choose how much you want decked of the head = $0.00 no extra charge - ( if you are not sure please\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"mailto:trade@gmmotorsport.com.au\" target=\"_blank\" rel=\"noopener\"\u003econtact us\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003efirst)\u003c\/p\u003e\u003cp class=\"box_spacer10\"\u003e\u003cstrong\u003eAdd Valve Springs:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePlease advise if you would like valve springs added to your order\u003c\/p\u003e\u003cp class=\"box_spacer10\"\u003e\u003cstrong\u003eValve Stem Seals:\u003c\/strong\u003e\u003cspan\u003e Please advise if you would like valve stem seals added to your order\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eChange Over:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePlease choose from our change over or outright option below\u003c\/p\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eChange Over: \u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003eYou can bring your heads in to store and direct swap for a finished set, or send us your heads first and we will send you a finished set back. Heads must have valves, retainers and locks. \u003cspan\u003eHeads must be undamaged, unmodified \u0026amp; in a satisfactory clean condition. Charges will apply for heads presented in a highly dirty state or minor repairs. Example (broken header bolts).\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurchase Outright:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eYou can purchase a set of heads outright and keep your own + $1299.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCore Holding Deposit:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eYou can pay a core holding deposit of $1299- and have this refunded to you when you send your heads back to us - (\u003cspan\u003eYou must send us your heads no longer than 2 weeks after receiving the ones we send you.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\u003cp\u003e\"Please note: Expected shipping of CNC Ported heads will be between 1-2 weeks from time of payment received or when change over heads are received\"\u003c\/p\u003e\u003cp\u003e\u003cspan\u003ePlease Deliver to 23 Reserve Road Melton 3337 with your name and number in the box!\u003c\/span\u003e\u003c\/p\u003e","brand":"GM Motorsport","offers":[{"title":"Default Title","offer_id":46571683119281,"sku":"GMM CNC LS1 241 CASTING","price":1690.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0727\/5793\/6305\/files\/CNCCylinderheads__52656.1746145691.1280.1280.jpg?v=1767911266"},{"product_id":"gmm-cnc-ported-ls1-241-casting-heads-pair-outright","title":"GMM CNC Ported LS1 (241 casting) Heads - Pair - \"Outright\"","description":"\u003cp\u003e1 Pair of Complete GMM CNC Ported LS1 (241 catsing) Heads - \"Outright\"\u003c\/p\u003e\u003cp\u003eWhat you get\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e \u003c\/li\u003e\n\u003cli\u003e550 GM Vave springs\u003c\/li\u003e\n\u003cli\u003eRefurbished 241 Cylinder Head castings\u003c\/li\u003e\n\u003cli\u003eCNC ported intake and exhaust ports\u003c\/li\u003e\n\u003cli\u003eultra sonic process\u003c\/li\u003e\n\u003cli\u003e16 valves ground\u003c\/li\u003e\n\u003cli\u003e8 intake valve seats turned on Newen cnc cutter Multiple angle variable shape\u003c\/li\u003e\n\u003cli\u003e8 Exhaust valve seats turned on Newen cnc cutter Multiple angle variable shape\u003c\/li\u003e\n\u003cli\u003eincreased compression ratio with deck face machined. \u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003ca href=\"https:\/\/www.gmmotorsport.info\/cncheads\"\u003eClick here for more information on our CNC heads\u003c\/a\u003e\u003c\/p\u003e\u003cp\u003e\u003ciframe src=\"\/\/www.youtube.com\/embed\/Qz1K8xyB8z0?t=167s\" width=\"560\" height=\"314\" allowfullscreen=\"allowfullscreen\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\u003cp\u003eIf you are looking for that extra edge or, more precisely, added power, then CNC technology will give you the results you need.\u003c\/p\u003e\u003cp\u003eIn fact, the cylinder head is one of the most, if not the most, important facets of engine horsepower.\u003c\/p\u003e\u003cp\u003eGMM Racing Heads have been supplying cylinder heads to major race teams \u003c\/p\u003e\u003cp\u003eThey have led the industry by providing superior performance cylinder heads to a broad cross-section of the racing world.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp class=\"box_spacer10\"\u003e\u003cspan\u003e\u003cstrong\u003eUpgrade Options\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp class=\"box_spacer10\"\u003e\u003cstrong\u003eDecking:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePlease choose how much you want decked of the head = $0.00 no extra charge - ( if you are not sure please\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"mailto:trade@gmmotorsport.com.au\" target=\"_blank\" rel=\"noopener\"\u003econtact us\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003efirst)\u003c\/p\u003e\u003cp class=\"box_spacer10\"\u003e\u003cstrong\u003ePSi Valve Springs:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePlease advise if you would like valve springs added to your order\u003c\/p\u003e\u003cp class=\"box_spacer10\"\u003e\u003cstrong\u003eValve Stem Seals:\u003c\/strong\u003e\u003cspan\u003e Please advise if you would like valve stem seals added to your order\u003c\/span\u003e\u003c\/p\u003e\u003cp class=\"box_spacer10\"\u003e\u003cspan\u003eCan be shipped within 48HRS of payment being received\u003c\/span\u003e\u003c\/p\u003e\u003cp class=\"box_spacer10\"\u003e\u003cspan\u003ePlease Deliver to 23 Reserve Road Melton 3337 with your name and number in the box!\u003c\/span\u003e\u003c\/p\u003e","brand":"GM Motorsport","offers":[{"title":"Default Title","offer_id":46571683184817,"sku":"GMM CNC LS1 241 CASTING OUTRIGHT","price":3499.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0727\/5793\/6305\/files\/CNCCylinderheads__36912.1593528849.1280.1280.jpg?v=1767911268"}],"url":"https:\/\/australiaspeed.com.au\/collections\/ls1-heads.oembed","provider":"Australia Speed","version":"1.0","type":"link"}