Toyota Supra 1990 Manual page 49

ENGINE MECHANICAL - Engine Tune-Up
Adjusting Shim Selection Chart
EXHAUST
Shim thicknesses
Exhaust valve clearance (cold):
0.20 - 0.30 mm (0.008 - 0.012 in.)
Example:
A 2.800 mm shim is installed and the
measured clearance is 0.450 mm.
Replace the 2.800 mm shim with
shim No. 22 (3.000 mm).
Shim
No.
02
04
06
08
10
12
14
16
18
Thickness
2.500 (0.0984)
2.550 (0.1004)
2.600 (0.1024)
2.650 (0.1043)
2.700 (0.1063)
2.750 (0.1083)
2.800 (0.1102)
2.850 (0.1122)
2.900 (0.1142)
Shim
No.
20
22
24
26
28
30
32
34
EM-17
mm (in.)
Thickness
2.950 (0.1161)
3.000 (0.1181)
3.050 (0.1201)
3.100 (0.1220)
3.150 (0.1240)
3.200 (0.1260)
3.250 (0.1280)
3.300 (0.1299)