Abstract: An improved mold is provided for forming concrete blocks wherein the mold is of the type that has at least one wall having a plurality of spaced projections extending inwardly from the wall into a block material forming cavity. The at least one wall further includes a lip at a bottom of the wall extending inwardly into the cavity with the lip having an inwardly extending lip extension disposed along its bottom. The improvement includes having the lowermost projections in abutment with a top surface of the lip, and a vertical inner surface of each projection being coplanar with an upper vertical inner surface of the lip.