BRAND NEW Black Aluminum 15 Degree Swivel Water Neck. Includes Bolts and O-Ring Gasket. Fits both Small & Big Block Chevy. This is a great design, as the swivel allows you to rotate the neck for optimal clearance purposes. Designed specifically for 1957-1993 Small Block Chevys & 1965-1976 Big Block Chevys but can be used for many custom applications and years.