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!