V 20 P/U 4WD V6-262 4.3L (1987)
Engine build code determination - Engine date code location is shown in Figure 1. The build date codes may be found in this area and appear as shown
in the following example:
T1202ABC
The first letter indicates the plant where the engine was manufactured. The next four numbers indicate the day of manufacture; in this case 12th month
2nd day, and the last three digits may be any broadcast code.