Thoroughly clean both sides of the steel spacer plate with a wire wheel or “Scotchbrite” pad. Use caution when cleaning around the liner hole with rotary abrasive pads. The spacer plate can be damaged if pad is not held parallel with the block surface. Gasket marks left on the plate are acceptable. The standard spacer plate measures 9.970 ± .025 mm (.3925 ± .0010 in). If the spacer plate has corrosion damage the thickness may vary an additional .025 mm (.001 in).