GM LS Rectangle Port Carburettor Single Plane Intake Manifold

Maximise Your LS3 Power with the GM LS Rectangle Port Carburettor Single Plane Intake Manifold

If you’re running a GM LS3 Rectangle Port engine and want to step away from EFI for a traditional carburettor setup, the Aeroflow AF6040-6000 Single Plane Intake Manifold is your perfect street-performance upgrade. Designed specifically for non-EFI applications, this manifold is engineered to deliver strong, responsive power in the 2500 to 7000 RPM range, making it ideal for street rods, muscle cars, and resto-mod builds right here in New Zealand.

Featuring a 4-barrel 4150 square bore carburettor pad, this intake manifold easily fits most popular carburettors, delivering consistent airflow to your LS3 engine. The natural cast finish offers a classic look while ensuring durability and performance.

Built for Performance and Practicality

The manifold’s single plane configuration promotes excellent top-end power and throttle response, perfectly suited for high-revving street builds. With a port size of 1.15" x 2.50", it matches the LS3’s rectangle port heads, ensuring smooth airflow and efficient combustion.

Measuring 122mm from carb pad to manifold base, it’s compact enough for many engine bays, but we recommend checking bonnet clearance to avoid any surprises during installation.

Complete with Installation Hardware

The GM LS Rectangle Port Carburettor Intake Manifold comes ready to bolt on with:

• 8 Intake Manifold O-Ring Gaskets (AF6233-5002)

• 4 x M6 x 1.00mm Hex Screws (80mm UHL)

• 6 x M6 x 1.00mm Hex Screws (50mm UHL)

• 10 x M6 Flat Washers

• 1 x 3/8" NPT Steel Port Plug

• 5/16-18" Carburettor studs (x4)

• 6 x 5/16-18" Mounting holes

• 3/8" NPT Port (x1)

Everything you need for a smooth and professional installation.

Features and Benefits

Direct Fit for LS3 Rectangle Port Heads – Perfectly matched port size for excellent airflow and power gains.

4-Barrel 4150 Carburettor Pad – Compatible with a wide range of popular carburettors for easy upgrades.

Single Plane Design – Enhances top-end power and throttle response for spirited street driving.

Natural Cast Finish – Durable, clean look that complements engine bays of all styles.

Comprehensive Hardware Kit Included – Comes with all necessary gaskets, screws, studs, and plugs for hassle-free installation.

Technical Specifications

REVIEWS

Dylan M.
Wellington, NZ
★★★★★
"Swapped my LS3 over to this intake for a carburettor setup and it’s been spot on. Great fit and really wakes up the top-end power. Perfect for my street machine."

Sarah K.
Christchurch, Canterbury
★★★★★
"Everything was included for a smooth install. The manifold looks and performs great, and it’s just what my LS3 needed for that classic muscle car feel."