GM Service Manual Online
For 1990-2009 cars only

4.3L Engine


Object Number: 174107  Size: SH
(1)Engine Identification Number
(2)Alternative Engine Identification Number

Located on the VIN plate, the VIN provides detailed engine identification and code information by liter and by the engine code letter.

6.5L Diesel Engine


Object Number: 181919  Size: MF

The engine unit number or date code is either laser etched or stamped into the engine block.

5.0L and 5.7L Engines


Object Number: 181920  Size: SH

All engines are stamped with an eight digit engine identification number.

Figure 1:

7.4L Engine


Object Number: 181924  Size: SH
Figure 2:

Engine ID


Object Number: 174106  Size: SH
(1)Source Code
(2)Month of Build
(3)Date of Build
(4)Broadcast Code