MAIN:
Letters are on the block, numbers are on the crank, put the two together to get color code
ROD:
Letters are on the crank, numbers are on the rods, same process as above


Blue .0594-.0593
Black .0593-.0592
Brown .0592-.0591
Green .0591-.0590
Yellow .0590-.0589
Pink .0589-.0587
Red .0587-.0586


BC = IDBT – ODC – (2 x BT)

BC = bearing clearance
IDBT = inside diameter of bearing tunnel (housing bore)
ODC = outside diameter of crank journal
BT = bearing thickness

Main Bearing thickness by color
Blue 2.013-2.010 mm 0.0793”- 0.0791”
Black 2.010-2.007 mm 0.0791”- 0.0790”
Brown 2.007-2.004 mm 0.0790”- 0.0789”
Green 2.004-2.001 mm 0.0789”- 0.0788”
Yellow 2.001-1.998 mm 0.0788”- 0.0787”
Pink 1.998-1.995 mm 0.0787”- 0.0785”
Red 1.995-1.992 mm 0.0785”- 0.0783”

Rod bearing thickness by color
Blue 1.510-1.507 mm 0.0594”- 0.0593”
Black 1.507-1.504 mm 0.0593”- 0.0592”
Brown 1.504-1.501 mm 0.0592”- 0.0591”
Green 1.501-1.498 mm 0.0591”- 0.0590”
Yellow 1.498-1.495 mm 0.0590”- 0.0589”
Pink 1.495-1.492 mm 0.0589”- 0.0587”
Red 1.492-1.489 mm 0.0587”- 0.0586”

Although most people do not have inside micrometers, bearing micrometers or snap gauges,
you can still use this chart when using plastigage to check bearing clearance.
If you want to increase or decrease a bearing clearance, you can calculate how much
of a color change is necessary by looking at the changes on the chart. Remember you can
mix colors for even a more fine-tuning but it would not be wise to jump more than one color.
In other words, do not mix a brown and yellow bearing together to equal a green clearance
value. Just use the greens together. It is ok to mix a green with a yellow or a green with a
brown. When doing your rebuild and replacing bearings with like colors, you still must check
your results with plastigage to be sure. Don’t assume anything. Also remember, when swapping
to aftermarket rods, throw the color codes away as they will not work anymore. You need to
start from scratch to obtain your desired clearance. On the other hand, you really cannot
measure accurately to the nearest .0001” without machinist quality tools, so don’t get carried away on that last one ten thousandth of an inch variance.