piston88Instructions: Enter a value in the un-shaded boxes below as they pertain to your engine. Note: For pistons BELOW the block @ TDC – value in box must be a POSITIVE number (.000) Note:Honda H22 Piston, 88.00 mm Bore, 30.94 mm Compression Heht, 0.866 in. Pin Diameter, Sport Compact, Set of 1.