BBC S/W Intake Manifold - Oval Port

The WEIAND BBC S/W Intake Manifold – Oval Port is a street-focused dual-plane intake designed for big-block Chevrolet engines demanding reliable mid-range torque and responsive throttle characteristics. This manifold serves builders and enthusiasts who prioritize drivability over peak horsepower, making it ideal for street cars, trucks, and marine applications where broad power delivery matters more than rpm ceiling performance. Engineered as a spread-bore, square-bore design, it accommodates factory and many aftermarket carburetors without adapter plates, simplifying installation on both original and modified platforms.

Constructed from lightweight aluminum in natural finish, the oval-port configuration optimizes runner sizing and cross-sectional flow for mid-range cylinder charging without the high-rpm peak benefits of single-plane designs. The dual-plane runner layout separates intake pulses between cylinder pairs, reducing reversion and heat soak while promoting more complete combustion across the power band—a hallmark of street warrior engineering. At 19.84 pounds, the aluminum construction keeps rotating assembly mass minimal compared to cast-iron alternatives, reducing parasitic losses and improving throttle response. The manifold's 12 x 7.4 x 25.2-inch envelope fits standard big-block Chevy engine bays without interference, maintaining hood clearance on most vehicles.

Engine builders and street enthusiasts restoring or upgrading big-block Chevy mills benefit most from this manifold's blend of throttle response and part-throttle flexibility. Installation requires only standard bolt-down attachment to the cylinder heads and carburetor mounting; no spacers or adapters are necessary for most square-bore carb setups, expediting builds and reducing leak points. The natural aluminum finish resists corrosion in typical underhood environments and accepts high-temperature ceramic or powder coating for custom aesthetics. Ideal for 454, 427, and 402 applications where consistent street performance outweighs dyno sheet numbers, this intake delivers the responsive power curve that makes older muscle cars and trucks genuinely enjoyable to drive daily.