351m/400 Ford Action Plu

The WEIAND 351M/400 Ford Action Plus intake manifold is a square-bore, dual-plane aluminum casting engineered for Ford Cleveland and modified engine platforms. Designed with a natural finish, this manifold optimizes the fuel-air mixture distribution critical to engine efficiency and power delivery across a broad RPM band. The Action Plus design represents a proven architecture for street and performance applications where balanced power curve characteristics outperform single-plane alternatives.

The dual-plane configuration splits the intake runners into upper and lower plenums, favoring low-to-mid-range torque production while maintaining high-RPM capability. This design strategy makes the Action Plus manifold ideal for applications prioritizing streetable power over peak-RPM horsepower. Aluminum construction provides weight savings over cast-iron alternatives, and the square-bore design ensures compatibility with matching carburetors and fuel induction systems. At 22.31 lbs, the manifold's mass is manageable without compromising structural integrity or thermal stability under sustained operation.

This intake is specified for Ford Cleveland engines and modified variants operating in street, bracket racing, and performance restoration contexts. Builders selecting a WEIAND Action Plus manifold typically prioritize intake runner scavenging efficiency and want a proven, straightforward platform without exotic tuning requirements. The natural aluminum finish supports custom painting or protective coating to match engine bay aesthetics or corrosion-prevention strategies. Part number 8010 is the exact OEM reference for this casting; verify fit against your specific Cleveland block and carburetor flange specifications before purchase.