LS3 Rectangle Port Carburettor Non EFI Hi Rise Single Plane Intake Manifold Black

Unlock the full potential of your GM LS engine with the LS3 Rectangle Port Carburettor Hi Rise Single Plane Intake Manifold in a striking Black finish. Engineered for retrofitting non-EFI setups, this hi-rise race-style manifold delivers a stable, even air/fuel distribution for maximum performance at high RPM.

Key Features

• Hi-rise, single-plane design optimized for high RPM and large displacement engines
• Carrburettor mounting pad compatible with 4150 square-bore carburettors (manual or electric choke options)
• Flat-style intake gasket ( Fel Pro 1222-2 or 1222-3 required)
• Black finish for a durable, race-ready appearance

Specifications

• Square bore carburettor pad (4150 flange)
• Overall height (carb pad to bottom of manifold): 171 mm (check bonnet clearance)
• Port Size: 1.08" x 2.50"
• RPM operating range: 3500 to 8000
• Includes: 4 x 5/16-18" carburettor studs, 10 x M6 x 1.00mm hex screws (50 mm OAL), 10 x M6 flat washers

What It Fits

• Designed to suit GM LS Gen III and IV engines equipped with LS3 rectangle port cylinder heads
• Non-EFI retrofit applications for carburetted, throttle body EFI, or port EFI setups
• Compatible with LS1/LS2 engines as part of retrofit or upgrade projects

Why Choose This Manifold

• Consistent air & fuel delivery with a dedicated single-plane configuration, maximizing power and throttle response at high RPM
• Simplified retrofit path from EFI to carburettor, enabling classic carburetted performance on modern LS engines
• Specific compatibility with 4150 square-bore carburettors and straightforward gasket selection for reliable sealing

Installation & Use Considerations

• Carburettor mounting pad accepts aftermarket 4150 square-bore carbs; ensure you select a compatible carb with the appropriate choke option
• Use the flat-style gasket specified (Fel Pro 1222-2 or 1222-3) for proper sealing
• Verify bonnet clearance due to the 171 mm overall height