{"product_id":"ls1-cathedral-port-carburettor-street-single-plane-efi-int-manifold","title":"LS1 Cathedral Port Carburettor Street Single Plane EFI Int Manifold","description":"\u003cdiv\u003e\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eUpgrade your GM LS performance with this Street Low Rise Cathedral Port EFI Intake Manifold. Crafted in a natural cast finish, this single-plane 4150 square-bore intake is engineered for LS1\/LS2 cathedral-port heads in EFI configurations, delivering a steady, even air-fuel distribution for enhanced street and strip performance. Designed to sit atop your engine with a 4150 throttle body, it targets high-RPM efficiency and responsive throttle response.\u003c\/p\u003e \u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eEFI-specific single-plane intake manifold for GM LS Gen III\/IV cathedral-port engines\u003c\/li\u003e \u003cli\u003eNatural cast finish; 4150 square-bore carburetor pad\u003c\/li\u003e \u003cli\u003eLow-rise design with an overall height of 122 mm (carb pad to bottom) – check bonnet clearance\u003c\/li\u003e \u003cli\u003ePort size: 0.95\" x 2.45\"; RPM operating range 2500 to 7000\u003c\/li\u003e \u003cli\u003eCarburettor studs: 5\/16-18\" (x4); 3\/8\" NPT port (x1); mounting holes: 6×5\/16-18\"\u003c\/li\u003e \u003cli\u003eGasket O-Ring: AF6233-5002; intake manifold O-Rings included\u003c\/li\u003e \u003cli\u003eCompatibility: fits GM LS1\/LS2 cathedral-port engines with EFI; not compatible with factory OEM fuel rails\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhat’s Included\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e8 × Intake Manifold O-Ring Gaskets (AF6233-5002)\u003c\/li\u003e \u003cli\u003e4 × M6 × 1.00mm Hex Screws (80 mm UHL)\u003c\/li\u003e \u003cli\u003e6 × M6 × 1.00mm Hex Screws (50 mm UHL)\u003c\/li\u003e \u003cli\u003e10 × M6 Flat Washers\u003c\/li\u003e \u003cli\u003e1 × 3\/8\" NPT Steel Port Plug\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eFuel Rail Kit \u0026amp; EFI Accessories\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eEFI applications require Aeroflow Fuel Rail Kit AF6999-5000 (included with this manifold)\u003c\/li\u003e \u003cli\u003e2 × Fuel Rails (-8ORB)\u003c\/li\u003e \u003cli\u003e1 × -8AN cross over braided line with two 90-degree non full-flow fittings\u003c\/li\u003e \u003cli\u003e3 × -8AN to -8ORB fittings\u003c\/li\u003e \u003cli\u003e1 × -8ORB hex port plug\u003c\/li\u003e \u003cli\u003e6 × long mounting brackets; 6 × short mounting brackets\u003c\/li\u003e \u003cli\u003e6 × 5\/16-18\" hex screws (18.5 mm UHL); 6 × 5\/16-18\" hex screws (12 mm UHL)\u003c\/li\u003e \u003cli\u003e4 × M6 nuts\u003c\/li\u003e \u003cli\u003e8 × 14 mm Injector O-Rings\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eSpecifications \u0026amp; Compatibility\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eCarburettor pad: 4150 flange\u003c\/li\u003e \u003cli\u003eOverall height (carb pad to bottom): 122 mm\u003c\/li\u003e \u003cli\u003ePort Size: 0.95\" x 2.45\"\u003c\/li\u003e \u003cli\u003eIntake gasket O-Ring: AF6233-5002\u003c\/li\u003e \u003cli\u003eNotes: For NON-EFI applications, use AF6040-5000\u003c\/li\u003e \u003cli\u003eDesigned to convert GM LS engines to accept a 4150-style throttle body for retrofit applications\u003c\/li\u003e \u003cli\u003eSingle-plane configuration optimized for steady air\/fuel distribution at high RPM\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eApplications \u0026amp; Fitment\u003c\/h3\u003e\n\u003cp\u003eSpecifically designed to suit GM LS Gen III and IV engines equipped with OE or aftermarket LS1\/LS2 cathedral-port cylinder heads. The carburettor-mounting pad accepts aftermarket 4150 square-bore throttle bodies or adapter plates for turbocharged setups. This manifold is ideal for enthusiasts seeking a reliable EFI upgrade that preserves street drivability while enabling high-RPM performance.\u003c\/p\u003e \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eEFI fuel rails are required; factory OEM rails are not compatible with this manifold\u003c\/li\u003e \u003cli\u003eInjector sizing: use 14 mm short (33.60 mm) injectors or 3\/4\" length (48.65 mm) injectors (sold separately)\u003c\/li\u003e \u003cli\u003eCheck bonnet clearance due to the manifold height\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":47273361080490,"sku":"AF6050-5000","price":765.5,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/7829\/4698\/files\/s-l1600_f177e3cf-e93e-40f4-bb69-acc1788e7d0b.webp?v=1753663399","url":"https:\/\/tgmperformance.com.au\/products\/ls1-cathedral-port-carburettor-street-single-plane-efi-int-manifold","provider":"TGM Performance Parts","version":"1.0","type":"link"}