1966 , , , BrassDual Cylinder Distribution Block. When converting to dual cylinder or disc brakes.This is a brand newdual distribution block for 66 A-body cars. This block is made exactly like the original butseparates the front brakes from the rears, so if a line was ever to blow out you would not loose both front and rearbrakes. The block mounts to the frame just below the cylinderjust like the original. 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 adual cylinder simply attach the blockplumb new cylinder lines and you are done. If you are converting to disc brakes do the same but remember to add inyour adjustable valve somewhere in the front to rear brake line so you can tune in the rear brakes.