The Edelbrock RPM Air-Gap intake for 1955–1986 small-block Chevrolet V8s uses an open Air-Gap to separate intake runners from engine heat, producing a cooler, denser air charge aimed at stronger power and throttle response. The Performer RPM design is intended for square-bore carburetors and is built for street high-performance applications where intake temperature control and improved breathing are priorities.
Edelbrock S/B Chevy RPM Air-Gap Manifold