Edelbrock Perf RPM 330-403 Manifold

This Edelbrock Performer RPM intake manifold is built with a dual-plane, 180-degree firing order design, specifically tuned to maximize top-end horsepower for Oldsmobile 330, 350, and 403 cubic inch engines. It also fits 1980-1/2 to 1985 307 c.i.d. engines equipped with 5A heads (casting #3317). This manifold is a high-rise unit, meaning it sits taller than stock, which helps improve airflow to the cylinders for better performance at higher RPMs.

The port flanges on this manifold have extra material above the runner. This is a practical detail that allows for porting to match larger cylinder heads, such as Edelbrock's own Performer RPM heads (#60519) or cast iron 455 heads. You'll also find it has ample clearance for an HEI distributor, simplifying installation. The carburetor mounting pad is designed to accept standard square-bore carburetors directly, without the need for adapters, making setup straightforward.

This manifold is a solid choice for anyone looking to extract more power from their classic Oldsmobile V8, and it also fits a wide variety of Buick, Chevrolet, and Pontiac vehicles from the mid-60s through the mid-80s. It's engineered to work well with Edelbrock's Total Power Package components to help you achieve maximum gains across your engine's operating range.