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As a final step before assembly, we ran a 320-grit Flex Hone through each of the cylinders. Flex Hone recommends using 30-weight oil as a lubricant during this process. We only needed to make between five and seven passes with the hone to achieve a good-looking crosshatch pattern on the cylinder walls. We then thoroughly cleaned the block with degreaser followed by car wash soap, then blew it dry and wiped all the sealing surfaces with WD-40 before painting the outside of the block with Rust-Oleum engine paint.