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Daniel goes to work honing the block, while careful to keep the correct crosshatch pattern by carefully timing the up-and-down motion of the hone and not exceed the 0.004 piston-to-cylinder clearance we decided on. There's a fine line that needs adhered to when fitting pistons. Too loose and piston slap occurs; too tight and cylinder walls are scored from the tight fit. The crosshatch pattern helps retain oil in the cylinder during the break-in period.