Engine identification can take place using various methods. The VIN, described earlier in this section, contains a code identifying the engine which was originally installed in the vehicle. In most cases, this should be sufficient for determining the engine with which your truck is currently equipped. But, some older vehicles may have had the engine replaced or changed by a previous owner. If this is the case, the first step in identification is to locate an engine serial number and code which is laser etched, stamped on the block or located on adhesive labels that may be present on valve covers or other engine components.
See Figure 1
The engine identification number is stamped on a flat, machined surface, on the left rear of the engine block, near the flywheel.
See Figures 2 and 3
The engine identification number is stamped either on a flat, machined surface, on the right-front of the engine block, just above the water pump (on some earlier model engines), or on the left-rear side of the engine block, where the transmission is joined to the engine.