Used when converting to dual cylinder or disc brakes with power brakes. This is a dualdistribution block for 64-65 A-body cars. This block is made exactly like the original but separates the front brakes from the rears, so if a line was ever to blow out you would not loose both front and rear brakes. The block mounts to the frame just below the cylinder just like the original and the lines are preformed to account for the booster. The cylinder lines screw 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 dual cylinder upgrades. With safety as the number one concern with brakes this is a simple upgrade to make you car safer. If you are converting to a dual cylinder simply attach the block screw in the new cylinder lines and you are done. If you are converting to disc brakes do the same but remember to add in your adjustable valve somewhere in the front to rear brake line so you can tune in the rear brakes. If you are building a show winner or just converting for safety this auction is for you. This is a concourse level assembly with brass block, phosphate bracket lines and fittings ready to bolt in place. 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.