GM Service Manual Online
For 1990-2009 cars only

*Crankshaft Main Journal

**Engine Block Main Journal Bore

A or I

B or II

C or III

D or IIII

1 or I

Red/Pink

Pink

Pink/Yellow

Yellow

2 or II

Pink

Pink/Yellow

Yellow

Yellow/Green

3 or III

Pink/Yellow

Yellow

Yellow/Green

Green

4 or IIII

Yellow

Yellow/Green

Green

Green/Brown

5 or IIIII

Yellow/Green

Green

Green/Brown

Brown

6 or IIIIII

Green

Green/Brown

Brown

Brown/Black

Important: The color code is on the edge of the bearing. When using bearing halves of different colors, it does not matter which color is used in the top or bottom position.

*As the numbers increase, the crankshaft journal diameter decreases and the bearing thickness increases.

**As the letters or numbers increase, the main journal bore diameter increases and the bearing thickness increases.