Edelbrock 75621 RPM Air-Gap Intake Manifold Big Block Chevy Polished

The Edelbrock 75621 RPM Air-Gap 2-R intake manifold is engineered for street performance 396-502 cubic inch big block Chevrolet V8 engines equipped with high-performance rectangular-port cylinder heads. The innovative air-gap design features an open air space that separates the intake runners from the hot engine oil in the lifter valley, keeping the air/fuel mixture significantly cooler for a denser charge and increased power output.

Key Features:

• Dual-plane, high-rise design with 180-degree firing order for excellent top-end horsepower while maintaining strong throttle response
• Larger plenum and runners optimized to match free-flowing exhaust systems, high-lift camshafts, and other high-output engine modifications
• Ideal for high-performance street or competition engines operating up to 6,500 RPM
• Polished aluminum finish delivers a brilliant shine and classic appearance
• Includes rear water outlets for proper cooling system integration
• Two distributor clamp locations provide installation flexibility
• Nitrous oxide bosses for forced induction applications
• Accepts all late-model alternator and air conditioning brackets for street compatibility

Specifications:

• Application: Big block Chevy 396-502 cubic inch engines
• Port style: Rectangular-port heads only
• Carburetor flange: Square-bore only
• No provision for exhaust-heated chokes
• No exhaust crossover passage

This manifold is designed for serious performance enthusiasts who demand maximum power without sacrificing street driveability. The air-gap technology has proven itself on countless engines by reducing intake charge temperatures and improving overall performance.