LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1989 >> Forward Control 3.9 L, Standard >> Repair and Diagnosis >> Engine Performance >> Adjustment >> Tune-Up - V8 >> Adjustments >> Engine Identification
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Engine Identification

Engines can be identified by the eighth character of the Vehicle Identification Number (VIN). The VIN number is stamped on a plate located on the dash and toe panel on "P" series, and on a plate at upper left corner of dash on all other models.

VIN ENGINE CODES

Engine Code
5.0L TBI H
5.7L TBI K
7.4L 4-Bbl W
7.4L TBI N