Chevrolet Workshop Service and Repair Manuals

Piston: Specifications

Piston to Cylinder Bore Clearance ............................................................................................................................  0.02-0.04 mm (0.0008-0.0015 inch)
Piston Diameter

Original Piston ............................................................................................................................................  73.970-73.990 mm (2.9122-2.9130 inch)
0.25 mm (0.0098") Oversize .......................................................................................................................  74.220-74.239 mm (2.9220-2.9224 inch)
0.050 mm (0.0197") Oversize .....................................................................................................................  74.470-74.480 mm (2.9319-2.9323 inch)

Piston Ring End Cap Top Ring 

Standard ....................................................................................................................................................................  0.2-0.3 mm (0.0079-0.018 inch)
Maximum Limit .........................................................................................................................................................................  0.7 mm (0.0276 inch)

Piston Ring End Cap Second Ring

Standard ..................................................................................................................................................................  0.2-0.3 mm (0.0079-0.0118 inch)
Maximum Limit .........................................................................................................................................................................  0.7 mm (0.0276 inch)

Piston Ring End Cap Oil Ring

Standard ..................................................................................................................................................................  0.2-0.6 mm (0.0079-0.0275 inch)
Maximum Limit .........................................................................................................................................................................  1.8 mm (0.0708 inch)

Piston Ring Groove Clearance

First Ring .............................................................................................................................................................  0.03-0.07 mm (0.0012-0.0027 inch)
Second Ring ........................................................................................................................................................  0.02-0.06 mm (0.0008-0.0023 inch)