lemon-mirror:
Home >> GMC >> 1987 >> Forward Control 5.7 M, Standard >> Repair and Diagnosis >> Engine Performance >> Adjustment >> Tune-Up - Diesel >> Identification >> Engine Identification

Engine Identification

Engines can be identified by the eighth character of Vehicle Identification Number (VIN) which is stamped on a tag at the top left corner of instrument panel. The 6.21, engine is also identified by code letters, located on a label at front and rear of right valve cover and also stamped into block on left front corner.

ENGINE CODES

Engine Code
6.2L (379") V8 (Light Duty Emissions) C
6.2L (379") V8 (Heavy Duty Emissions) J