Edelbrock Part #75621 Polished RPM Air-Gap Intake Manifold for Chevrolet Big-Block Engines

Edelbrock part #75621 RPM Air-Gap 2-R intake manifold is designed for street 396-502 c.i.d. Chevrolet V8's with high-performance rectangular-port heads. The open air space separates the runners from the hot engine oil, and as a result, the air/fuel mixture stays cooler for a denser charge and more power. This intake manifold is a dual-plane, high-rise design with a 180 degree firing order to produce incredible top-end horsepower while retaining good throttle response. The larger plenum and runners match the free-flowing exhaust, high-lift cams and other modifications of a high output engine. They are intended for high-performance's street or competition engines that run up to 6500 rpm. Includes rear water outlets, two distributor clamp locations and nitrous bosses. Accepts all late model alternator and A/C brackets for the street. For square-bore carbs only. No provision for exhaust heated chokes and no exhaust crossover. This manifold offers a polished finish for a brilliant shine and classic look. MANIFOLD; 1965-00 BB CHEVY 395-454; RECT PORT; RPM AIR-GAP; POLISHED Chevrolet:Big-Block Mark IV:396 (6.5L)-502 (8.2L)

• Larger Plenum and Runners Maximizes Other Upgrades

The Edelbrock Part #75621 RPM Air-Gap intake manifold is engineered for high-performance street and competition Chevrolet big-block engines ranging from 396 to 502 cubic inches. Its open plenum design separates the runners from the hot engine oil, maintaining cooler air and fuel mixture temperatures for a denser charge that maximizes power output. The dual-plane, high-rise construction with a 180-degree firing order delivers exceptional top-end horsepower while preserving responsive throttle control. This manifold’s larger plenum and runners are optimized to match high-flow exhaust systems, high-lift camshafts, and other modifications typical of high-output engines, making it an ideal upgrade for performance enthusiasts seeking increased horsepower up to 6500 rpm.
Built with durability and style in mind, the polished finish offers a brilliant shine and a classic appearance that complements any engine bay. It includes rear water outlets, two distributor clamp positions, and nitrous boss provisions, allowing for versatile installation options. Designed specifically for square-bore carburetors, this intake manifold does not accommodate exhaust heated chokes or crossover passages, emphasizing its focus on performance and efficiency. Compatible with late-model alternator and A/C brackets, it is suitable for a variety of Chevrolet models, including 1971-1972 Camaros and 1976-1977 GMC K25 Suburbans.
Constructed from high-quality materials, the Edelbrock RPM Air-Gap manifold enhances airflow and engine response, making it a critical component for racers and street performance builds aiming for maximum power and reliability. Its polished finish not only adds aesthetic appeal but also provides corrosion resistance, ensuring long-lasting performance under demanding conditions.

Features:

• Open air space separates runners from hot engine oil for cooler air/fuel mixture

• Dual-plane, high-rise design for increased top-end horsepower

• Large plenum and runners optimize airflow for high-performance engines

• Polished finish for a brilliant shine and classic look

• Includes rear water outlets, distributor clamp locations, and nitrous bosses

• Designed for square-bore carburetors only

• Compatible with late-model alternator and A/C brackets

• Ideal for engines up to 6500 rpm with high-lift cams and upgraded exhaust systems