Speedmaster 1-147-048 Ford 351W Windsor Low-Rise Intake Manifold Black

The Speedmaster 1-147-048 is a dual-plane low-rise intake manifold designed specifically for Ford 351W Windsor engines. This street-legal manifold delivers excellent all-around performance, providing strong top-end power while maintaining robust bottom-end torque for aggressive street applications.

Key Features:

• Dual-plane design with long runners for balanced power delivery across the RPM range
• Low-profile construction—the lowest profile manifold in the Speedmaster lineup
• Set up for spread bore carburetors with included adapter plate for square bore compatibility
• Rear water crossover passage for more balanced cylinder head temperatures and cooler operation
• Integrated nitrous bosses correctly positioned for port nitrous injector installations
• Durable black finish for a clean, professional appearance
• 100% pressure tested at the factory to ensure no air, water, or exhaust leaks

Recommended Carburetor Sizing:

• Street use: 600-750 CFM vacuum secondary or double pumper carburetor
• Competition use: 750-850 CFM double pumper carburetor

This manifold is ideal for street performance builds with aggressive camshafts, offering the perfect balance between daily drivability and weekend performance. Its street-legal design makes it suitable for pollution-controlled vehicles when paired with appropriate emissions-compliant components.