64-65 GM A-body Brass Single Cylinder Distribution Block. Application: 64-65 , Elcamino, 64-65 , 64-65 , , , 64-65 This is the distribution block for 64-65 A-body cars. The block mounts to the frame just below the cylinder and the single cylinder line screws into the top while the left and right front lines screw into the sides and the front to rear screws into the back. This block is for the single cylinder cars that are restored using the original drum brakes. Often these blocks are missing, thrown away, or striped. This is not 1966 A-body that block is different, the front to rear brake line went to 1/4" so the fitting is larger. This piece is exact to NOS in every detail. is the correct size, shape and thickness brass with the bracket attached exactly as the original was. This is a concours level brass part with phosphate bracket. The original is impossible to restore since the bracket does not come off the piece.