Genuine GM Intake Manifold 25534401 – Suits LS3 / L92 / L76 / L98 Rectangular Port Cylinder Heads

Genuine GM Intake Manifold 25534401 is a factory aluminium intake manifold designed for use on GM Gen IV rectangular-port cylinder heads such as the LS3, L92, L76, and L98. It allows the use of a traditional 4-barrel carburettor on modern LS-series engines and is ideal for custom street, muscle-car, or performance conversion builds.

Fitment:

• GM LS3, L92, L76, and L98 rectangular-port cylinder heads
• Suitable for Gen IV LS-based engines using a carburettor setup
• Not compatible with cathedral-port heads (LS1, LS6, early LS2)

Specifications:

• OEM Part Number: 25534401
• Material: Cast aluminium
• Intake Style: Single-plane performance design
• Carburettor Flange: 4150 square-bore (4-barrel)
• Vacuum Port: 3/8″ NPT
• RPM Range: 3,000 – 7,500 RPM (recommended)
• Includes: Mounting hardware and installation instructions

Key Features:

• Genuine GM Performance component designed for LS3/L92/L76/L98 rectangular-port heads
• Allows a traditional carburettor setup on modern LS engines for simpler tuning or classic conversions
• High-flow single-plane design optimised for mid- to high-RPM performance
• Lightweight cast-aluminium construction with precision-machined flanges
• Perfect for LS swap projects, street performance, or race applications

Installation Tip: Clean all mating surfaces before installation. Use a new intake gasket set, verify port alignment, and torque bolts evenly in sequence to GM specifications.