For Standard-Deck (9.8") & Tall-Deck (10.2") B/B Chevy Rectangular Port. These single-plane intake manifolds are designed for use with large cubic inch big-block Chevy engines using the latest design conventional port heads. They are ideal for any 1,000+ horsepower drag race engine with high air flow requirements. All manifolds have an extra large carburetor outer flange with a 5" x 5" opening to fit high flow carburetors and throttle stops. Modern casting techniques create smooth, thin, extended divider walls for "out of the box" performance, just port match and go! #2896 features an improved runner design with an incredible 5.0 square-inches of runner area in the plenum.