GM Service Manual Online
For 1990-2009 cars only

The eighth character in the Vehicle Identification Number (VIN) identifies the engine. Adhesive-backed labels attached to the engine, laser etching or stampings on the engine block indicate the engine unit number/date code. All engines are stamped with a VIN derivative.

Figure 1:

4.3L Engine


Object Number: 661672  Size: SH
(1)Primary Engine Identification Number Location
(2)Secondary Engine Identification Number Location
Figure 2:

4.8L, 5.3L, 6.0L Engine


Object Number: 174107  Size: SH
(1)Primary Engine Identification Location
(2)Secondary Engine Identification Location
Figure 3:

8.1L Engine


Object Number: 661671  Size: SH
(1)Engine Identification Number Location
Figure 4:

6.6L Diesel Engine


Object Number: 660545  Size: SH
(1)Engine Identification Number Location