Impreza GT F4-2.5L Turbo (2009)
Piston: Service and Repair
CYLINDER AND PISTON
1) The cylinder bore size is stamped on the front upper face of the cylinder block.
NOTE:
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Measurement should be performed at a temperature of 20°C (68°F).
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Standard sized pistons are classified into two grades, "A" and "B". These grades should be used as guide lines in selecting a standard piston.
Standard diameter:
A: 99.505 - 99.515 mm (3.9175 - 3.9179 in)
B: 99.495 - 99.505 mm (3.9171 - 3.9175 in)
