Dual-Plane Intake Manifold

The Spelab RPM Air-Gap intake manifold is crafted from aluminum and features a dual-plane design, targeting enhanced street and high-performance applications for Holden V8 engines. It is engineered to fit 1988-1998 Holden Commodore V8 models equipped with VN cylinder heads, supporting displacements from 253 to 308 cubic inches. This manifold is optimized to deliver a balance of responsive throttle engagement and significant horsepower gains across a broad RPM range, specifically from 1500 to 6500 RPM. The Air-Gap design distinguishes this manifold by creating an intentional air gap between the intake base and the engine. This feature promotes cooler intake air temperatures and increased air density, leading to more efficient combustion and improved power output. It has been designed to ensure compatibility with both stock 1988-1998 EFI-style cylinder heads and the Edelbrock Holden VN RPM cylinder heads, offering flexibility for various build configurations. This intake manifold is configured for a single 4-barrel carburetor with a square-bore mounting pattern. While it comes as a complete intake section, users will need to purchase gaskets separately, as they are not included. For optimal fitment and sealing, especially when used in conjunction with SPELAB Holden VN RPM cylinder heads, additional gaskets or components may be necessary. The manifold's port exit dimensions measure 1.16 inches by 2.00 inches, and it has a standard deck engine block height. Its natural aluminum finish contributes to its aesthetic appeal and durability.