The "Sniper Jr." BBC Intake Manifold Series is designed with the perfect runner to plenum volume to maximize the power and acceleration curves of your engine. The "Sniper" series features cast injection bosses, 4500 series carburetor flange, four corner water bosses and your choice of oval or rectangle port openings. Tall deck models require either a slip collar distributor or a distributor designed for a tall deck block. There is not enough material in the intake floor to safely machine it to use a short deck distributor. This manifold is optimized for engines 468-540CID or larger with BBC cylinder heads such as the Sniper and Sniper X cylinder heads. RPM range for Sniper intake manifolds is 4,000 - 8,500.