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Home >> GMC >> 1999 >> C3500 HD 6.5 F, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Mechanical - 4.3L V6, 5.0L, 5.7L & 7.4L V8 - VINS [W,X,M,R,J]) >> Engine Identification

Engine Identification

WARNING: This page is about a different variant/trim than selected.

Engine is identified by eighth character of Vehicle Identification Number (VIN). VIN is stamped on a metal plate on the top left end of the instrument panel, near windshield. See ENGINE IDENTIFICATION CODES  table.

Engine can also be identified by engine identification (ID) number. Number is stamped on front of cylinder block, immediately forward of right cylinder head or on left side of cylinder block, on engine-to-transmission mating flange.

ENGINE IDENTIFICATION CODES

Engine (1) VIN Code Engine ID
4.3L
SFI W L35
SFI X LF6
5.0L SFI M L30
5.7L SFI R L31
7.4L SFI J L29
(1) Eighth character of VIN.
NOTE: In this article, references to Express and Savana also apply to 1998 G-Van.