Edelbrock part #7107 RPM Air-Gap LT1 utilizes the proven short runner tunnel-ram style, this manifold provides the next step up in performance for LT1 owners. Our patented Air-Gap design delivers a cooler and denser air stream for maximum power output. This intake manifold is designed to work with either a 52mm throttle body or 58mm throttle body. This manifold also accepts early and late OEM LT1 throttle bodies and fuel rails. #7107 is designed to match #61905/#61919 LT1 cylinder heads.