GMC 1993 Safari Owner's Manual page 298

Service & Appearance Cam
Vehicle Identification Number (VIN)
I
KO641
This is the legal identifier for your vehicle.
It
appears on a plate in the front
corner of the instrument panel, on the driver's side. You can see it if you
look through the windshield from outside your vehicle. The VIN also appears
on the Vehicle Certification and Service Parts labels and the certificates of
title and registration.
Engine Identification
The eighth character in your VIN is the engine code for your GM engine.
This code will help you identify your engine, specifications, and replacement
parts in this section.
6-60