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Piston

Item Specification
Piston diameter (grade 1) 3.4435 —3.4439 in ( 87.465 —87.475 mm)
Piston diameter (grade 2) 3.4438 —3.4444 in ( 87.4725 —87.4875 mm)
Piston diameter (grade 3) 3.4443 —3.4447 in ( 87.485 —87.495 mm)
Piston-to-bore clearance 0.0009 —0.0019 in ( .0225 —.0475 mm)
Piston ring groove width - compression (top) 0.0484 —0.0492 in ( 1.23 —1.25 mm)
Piston ring groove width - compression (bottom) 0.0484 —0.0492 in ( 1.23 —1.25 mm)
Piston ring groove width - oil 0.0799 —0.0807 in ( 2.03 —2.05 mm)
Piston skirt coating thickness 0.0004 —0.0007 in ( .009 —.019 mm)
Here's the piston info from the service manual. The material for the pistons is not listed however.
 
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