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Measuring Cylinder Bore Diameter

  1. GM4972Courtesy of GENERAL MOTORS COMPANY

    Using EN-8087  gauge, measure the cylinder bore diameter 35 mm (1. 378 in) down from deck face perpendicular to the crankshaft centerline. Refer to Engine Mechanical Specifications (L5Q) , or Engine Mechanical Specifications (LV7) .

  2. In the cylinder bore diameter is outside the specification the engine block must be replaced.
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