Big Block Chev Hi-Rise Single Plane Intake Manifold Oval Ports

Unleash the upper-end potential of your Big Block Chevy with a Hi-Rise Single Plane Intake Manifold engineered for oval-port heads. Built for large displacement engines, this intake is designed to deliver a steady, high-flow air/fuel path at elevated RPM, helping your 396–502ci engine reach and sustain peak performance from 3500 to 7500 RPM.

Key Benefits

• Single-plane configuration optimized for high-rpm, high-displacement Big Block Chevy builds.
• Oval-port design tailored for airflow efficiency on oval-port cylinder heads.
• Hi-Rise plenum promotes strong mid- and top-end charge for aggressive throttle response.
• Square-bore carburetor pad compatible with modern square-bore carburetors, with non-EGR operation.

Fitment & RPM Range

• Designed to fit Big Block Chevy engines from 396 to 502 cubic inches and paired with oval-port cylinder heads.
• Operates effectively in the 3500–7500 RPM range, making it suitable for both high-performance street and strip applications.

Technical Specifications

• Intake manifold type: Hi-Rise single-plane
• Port configuration: Oval ports
• Carburetor pad: Square bore
• Finish: Natural cast
• Overall height (carb pad to bottom): 160 mm (check bonnet clearance)
• Port size: 1.60" x 1.94"
• Gasket: Fel Pro 1212
• Carburetor studs: 5/16-18" (x4)
• Mounting holes: 5/16-18" (x2)
• Distributor hold-down holes: 3/8-16" (x2)
• Water ports: 1/2" NPT (x5) with four corner ports and a fifth front outlet

What’s Included

• Intake manifold gasket: Fel Pro 1212
• Carburetor studs: 5/16-18" (x4)
• Mounting holes hardware: 5/16-18" (x2)
• Distributor hold-down mounting holes: 3/8-16" (x2)
• Water ports: 1/2" NPT (x5)

Installation Considerations

• Intended for high-rpm, large displacement Big Block Chevy builds; port-matching to cylinder heads is recommended for optimal performance.
• In most setups, late-model water necks, air conditioning, alternator, and H.E.I. ignition systems will clear the manifold.
• Check bonnet clearance due to the 160 mm overall height.

Applications & Use Cases

• Big Block Chevy engines in the 396–502ci range requiring a high-rise, single-plane intake for racing, street performance, and aggressive track use.
• Oval-port cylinder head configurations where precise airflow routing and manifold height are critical.