World Products has made improvements to virtually every area of the new Merlin IV with the goal of producing the most technologically advanced and best performing iron BBC block available today! New features include thicker main webs for increased strength and thicker cylinder walls which are nominally .310" @ 4.600" bore. In addition to the standard BBC 9.800" and 10.200" deck heights, new are deck heights measuring 9.500", 9.850" and 10.250". The Merlin IV is available with a 2.120" BBC cam journal and standard .842" lifter bores, or with a 2.283" journal for a 55mm Babbitt cam and .904" lifter bores. World also has added a front oil feed for dry sump systems, and relocated the lifter oil feeds and restrictor provisions to the front of the block.