{"product_id":"gm-ls3-rectangle-port-carburettor-single-plane-efi-intake-manifold-black","title":"GM LS3 Rectangle Port Carburettor Single Plane EFI Intake Manifold Black","description":"\u003cdiv\u003e\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eTransform your GM LS3 rectangle port engine with this Street Single Plane EFI Intake Manifold in a sleek black finish. Designed to pair with 4-barrel square-bore carburettor setups, it delivers steady, even air and fuel distribution for enhanced street and strip performance. The low-rise, single-plane configuration keeps air velocity high to optimize throttle response and mid-range torque.\u003c\/p\u003e \u003ch2\u003eFits and Compatibility\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eSpecifically for GM LS3 rectangle port engines running EFI.\u003c\/li\u003e \u003cli\u003eIntended for GM LS Gen III\/IV engines equipped with rectangle port cylinder heads.\u003c\/li\u003e \u003cli\u003eNot compatible with factory OEM fuel rails; requires Aeroflow Fuel Rail Kit AF6999-6000 (included).\u003c\/li\u003e \u003cli\u003eRequires aftermarket injectors: either 14mm short (33.60mm) or 3\/4\" length (48.65mm) injectors (sold separately).\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eCarburettor and EFI Details\u003c\/h2\u003e\n\u003cp\u003eCarburettor mounting pad is 4150 square-bore (4-barrel) with a 4-bore carburettor pad. The design supports aftermarket 4150 square-bore throttle bodies or adapter plates for turbocharged applications, enabling a retro-fit look with a modern EFI setup.\u003c\/p\u003e \u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eManifold type: Single Plane, EFI, low rise\u003c\/li\u003e \u003cli\u003eCarburettor pad: Square bore 4150 flange\u003c\/li\u003e \u003cli\u003eOverall height (carb pad to bottom): 122mm (check bonnet clearance)\u003c\/li\u003e \u003cli\u003ePort size: 1.15\" x 2.50\"\u003c\/li\u003e \u003cli\u003eRPM operating range: 2500 to 7000\u003c\/li\u003e \u003cli\u003eGasket O-Ring: Included with manifold\u003c\/li\u003e \u003cli\u003eCarb studs: 5\/16-18\" x4\u003c\/li\u003e \u003cli\u003ePort plug: 3\/8\" NPT\u003c\/li\u003e \u003cli\u003eMounting holes: 6 x 5\/16-18\"\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhat’s Included with the Manifold\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e8 x Intake Manifold O-Ring Gaskets (AF6233-5002)\u003c\/li\u003e \u003cli\u003e4 x M6 x 1.00mm Hex Screws (80mm UHL)\u003c\/li\u003e \u003cli\u003e6 x M6 x 1.00mm Hex Screws (50mm UHL)\u003c\/li\u003e \u003cli\u003e10 x M6 Flat Washers\u003c\/li\u003e \u003cli\u003e1 x 3\/8\" NPT Steel Port Plug\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFuel Rail Kit Details\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eIncludes Aeroflow Fuel Rail Kit AF6999-6000\u003c\/li\u003e \u003cli\u003e2 x Fuel Rails (-8ORB)\u003c\/li\u003e \u003cli\u003e1 x -8AN crossover braided line with two 90-degree non-full-flow fittings\u003c\/li\u003e \u003cli\u003e3 x -8AN to -8ORB fittings\u003c\/li\u003e \u003cli\u003e1 x -8ORB hex port plug\u003c\/li\u003e \u003cli\u003e6 x long mounting brackets\u003c\/li\u003e \u003cli\u003e6 x short mounting brackets\u003c\/li\u003e \u003cli\u003e6 x 5\/16-18\" hex screws (18.5mm UHL)\u003c\/li\u003e \u003cli\u003e6 x 5\/16-18\" hex screws (12mm UHL)\u003c\/li\u003e \u003cli\u003e4 x M6 nuts\u003c\/li\u003e \u003cli\u003e8 x 14mm Fuel Injector O-Rings\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eApplication and Use Cases\u003c\/h2\u003e\n\u003cp\u003eIdeal for retro-fit street and performance builds that aim to run a 4150-style throttle body on GM LS engines while maintaining EFI control. The manifold’s design supports turbo-ready layouts via adapter plates and is crafted to suit LS3 rectangle port cylinder heads, delivering reliable airflow and fuel distribution across the RPM range.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":47273636495530,"sku":"AF6250-6000","price":786.1,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/7829\/4698\/files\/s-l1600_1_4317872a-b563-4e9f-82e7-38b04e71d1f2.webp?v=1753664548","url":"https:\/\/tgmperformance.com.au\/products\/gm-ls3-rectangle-port-carburettor-single-plane-efi-intake-manifold-black","provider":"TGM Performance Parts","version":"1.0","type":"link"}