Silvolite set of four pistons with slight surface corrosion.
.21 Deep Recess
L4 2.2L GM
1.170 Compression Height
Major Axis: 3.5320, +0.000, -.0005
Measure piston major axis at 70 deg F
Perpendicular to pin center line 1.880 from top of head
Recommended finished bore diameter: 3.5335