Measuring Cylinder Bore Diameter

Fig 1: Measuring Cylinder Bore

Courtesy of GENERAL MOTORS COMPANY

Measure the cylinder bore diameter 37 mm (1.457 in) from the deck face using the EN-8087  gauge.

Compare your results with the Engine Mechanical Specifications (LFX)Engine Mechanical Specifications (LFW) . If the cylinder diameter exceeds the specifications, the cylinder block may be oversized to 0.25 mm (0.010 in). There is only one size of oversized pistons and rings available for service.