The Edelbrock RPM Air-Gap Intake Manifold is engineered for high-performance street and mild race applications on Small Block Ford engines, including 289, 302, 331, and 347 cubic inch displacements. Its innovative Air-Gap design features an open space under the plenum, effectively separating the intake runners from the hot engine oil. This results in a cooler, denser air/fuel mixture, enhancing horsepower and torque output.
Key Features:
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Part Number: 7521
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Engine Compatibility: Ford Small Block 289, 302, 331, 347 CID V8s
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RPM Range: 1,500–6,500 RPM
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Intake Style: Dual-plane
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Carburetor Flange: 4150 square-bore (non-EGR)
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Material: Cast aluminum
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Finish: Natural satin
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Manifold Height: A – 4.30", B – 5.50"; Carb pad height – 4.90"
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Port Exit Dimensions: 1.04" x 1.85"
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Additional Features: Includes nitrous bosses; no provisions for exhaust-heated chokes or exhaust crossover
This manifold is ideal for hot rodders, street machine enthusiasts, and bracket racers seeking optimum performance in the 1,500–6,500 RPM range. The larger runners (7% increase at the plenum entries compared to the standard Performer RPM design) are beneficial for larger CID stroker engines.
Installation Notes:
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Carburetor Recommendations: Compatible with Edelbrock Performer Series carburetors, such as the 600 cfm (manual choke, part #1405) and 750 cfm (manual choke, part #1407).
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Throttle Bracket Compatibility: Accepts all late-model alternator and A/C brackets for the street.
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Emissions Note: This manifold is not equipped with EGR provisions and is intended for non-emissions-controlled vehicles.