BBC Oval Port Intake Manifold - Dual Plane

The BBC Oval Port Intake Manifold – Dual Plane by Air Flow Research is engineered for big-block Chevrolet engines seeking optimized low-to-mid-range torque and responsive throttle characteristics. Built for serious engine builders and performance enthusiasts, this dual-plane design distributes fuel and air evenly across cylinder banks, making it ideal for street applications, bracket racing, and high-output naturally aspirated builds where cylinder-to-cylinder balance and drivability matter.

This manifold leverages precision casting and internal runner geometry that reduces turbulence and promotes laminar flow dynamics across both intake planes. The dual-plane layout isolates cylinder firing order, preventing cross-cylinder interference and fuel distribution inconsistency—a critical factor in engines where carburetor or fuel-injection tuning depends on even mixture delivery. Weighing 21.58 lbs and measuring 13.5 × 8.5 × 25 inches, the manifold balances structural rigidity with manageable weight, allowing installers to maintain proper engine bay proportions while maximizing thermal stability under sustained load.

Street cruisers and weekend racers benefit most from this manifold's optimized torque band of 1,500–5,500 RPM, ensuring excellent performance without sacrificing top-end potential. Whether you're rebuilding a 427, 454, or other BBC platform, this manifold is designed to meet the demands of high-performance applications. AFR's manufacturing pedigree ensures cast-iron durability and repeatability across production runs, making it a reliable choice for any serious engine builder.