GMC Workshop Service and Repair Manuals

Crankshaft: Specifications
Journal/Bearing Dimensions

Journal/Bearing Dimensions 

Crankshaft Journals

Main Bearing Journal Diameter

Note:  Nos. 1, 2 & 4, 2.4937-2.4946 inch; No. 3,

2.483-2.494 inches.

Connecting Rod Journal Diameter

1.9983-1.9994 in 

Maximum Out Of Round All

0.0002 in 

Maximum Taper All

0.0002 in 

Runout Service Limit

0.001 in 

Bearing Clearance

Main Bearings

.0016-.0032 in 

Thrust Bearing

Note:  Thrust clearance, .002-.0033 inch; end play,

.0023-.008 inch.