{"product_id":"ls1-cathedral-port-carburettor-hi-rise-single-plane-intake-manifold","title":"LS1 Cathedral Port Carburettor Hi Rise Single Plane Intake Manifold","description":"\u003cdiv\u003e\n\u003ch2\u003eGM LS Cathedral Port Hi Rise 4-Barrel Carburettor Intake Manifold (Non-EFI)\u003c\/h2\u003e\n\u003cp\u003eRetro-fit your GM LS engine from EFI to a true 4150 square-bore carburettor with this Hi Rise Single Plane intake. Designed in the spirit of a Super Victor style manifold, it delivers a clean, steady air and fuel path for optimized high-rpm performance on LS1\/LS2 cathedral port heads.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSingle Plane, Hi-Rise Performance:\u003c\/strong\u003e Engineered for high rpm and large displacement, keeping air and fuel moving consistently into the cylinders for strong throttle response and top-end power.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e4150 Square-Bore Carburettor Pad:\u003c\/strong\u003e Accepts aftermarket 4-barrel square-bore carburettors with either manual or electric choke options.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eGM LS Cathedral Port Compatibility:\u003c\/strong\u003e Specifically designed for GM LS Gen III\/IV engines equipped with LS1\/LS2 cathedral port cylinder heads.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNon-EFI Applications:\u003c\/strong\u003eIdeal for retro-fit carburettor setups, throttle-body EFI, or port EFI configurations.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eGasket \u0026amp; Hardware Ready:\u003c\/strong\u003e Uses a flat-style intake gasket (Fel Pro 1312-2 or 1312-3 recommended). Supplied with 4 carburettor studs (5\/16-18) and complete mounting hardware (10 M6 x 1.00mm hex screws and 10 M6 washers).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRobust Build:\u003c\/strong\u003e Natural cast finish with a compact 4-bolt, square-bore flange to ensure reliable sealing and durability under high-load, high-RPM conditions.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePort Size:\u003c\/strong\u003e 1.08\" x 2.50\"\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCarburettor Pad:\u003c\/strong\u003e 4150 square-bore flange\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOverall Height (carb pad to bottom):\u003c\/strong\u003e 171 mm (bonnet clearance should be checked)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRPM Operating Range:\u003c\/strong\u003e 3500 to 8000\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncludes Hardware:\u003c\/strong\u003e 4 x 5\/16-18\" carburettor studs, 10 x M6 x 1.00mm hex screws (50 mm UHL), 10 x M6 flat washers\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eGasket Recommendation:\u003c\/strong\u003e Flat gasket (Fel Pro 1312-2 or 1312-3)\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhat You’ll Achieve\u003c\/h3\u003e\n\u003cp\u003eWith this hi-rise cathedral-port manifold, LS enthusiasts gain a stable, high-flow air delivery path that supports aggressive cam profiles and high-rPM operation. Its single-plane design minimizes plenum restrictions, helping your engine deliver smooth torque at higher revs while maintaining drivetrain usability for street-driven builds. The manifold’s non-EFI nature frees you to run a traditional carburettor setup or integrate with throttle-body or port EFI systems as your project evolves.\u003c\/p\u003e \u003ch3\u003eFitment \u0026amp; Applications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eFits GM LS1\/LS2 cathedral port engines (Gen III\/IV) using a 4150 square-bore carburettor pad.\u003c\/li\u003e \u003cli\u003eSuitable for retro-fit applications where a carburettor or hybrid EFI configuration is desired.\u003c\/li\u003e \u003cli\u003eNot OEM EFI; designed to replace EFI intake manifolds in appropriate LS cathedral port builds.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhat’s Included\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eIntake Manifold (Natural Cast Finish)\u003c\/li\u003e \u003cli\u003e10 x M6 x 1.00mm Hex Screws (50 mm UHL)\u003c\/li\u003e \u003cli\u003e10 x M6 Flat Washers\u003c\/li\u003e \u003cli\u003e4 x 5\/16-18\" Carburettor Studs\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eNote: Check bonnet clearance due to the 171 mm overall height to ensure proper fitment under your hood. This manifold is ideal for hot-rod projects and performance builds where reliable carburettor-to-engine tuning is essential.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":47266840772778,"sku":"AF6040-5005","price":642.2,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/7829\/4698\/files\/s-l1600_4438aa0f-e856-4432-ab29-d2fa9add670e.webp?v=1753412246","url":"https:\/\/tgmperformance.com.au\/products\/ls1-cathedral-port-carburettor-hi-rise-single-plane-intake-manifold","provider":"TGM Performance Parts","version":"1.0","type":"link"}