Tom finish-hones all of his blocks to suit specific needs. For the Engine Masters Challenge powerplant, he'll run 220-, 280-, and 400-grit stones in succession, lessening the pressure with each stone change. The final cross-hatch angle will be between 20-30 degrees. The final finish will be provided by a plateau hone, which looks like a big bottle brush. The final bore size will be 4.005 inches.