GMC SIERRA 1994 Manual page 352

Engine Emissions Classification
-
Gas Engines
Engine
Type
VIN
Fuel System
Emissions
5.0L
V8
H
TBIT
LD
*Light Duty Emissions with 8500 GVWR and below or:
:%*Heavy Duty Emissions with 8501 GVWR and above
+Throttle Body Injection
Engine Emissions Classification
-
Gas Engines (cont.)
Engine
Type
VTN
Fuel System
Emissions
5 . 7 L
V8
K
TBTT
LD*/HD*'k
7.4L
V8
N
TBIY
LD*/HD**
*Light Duty Emissions with 8500 GVWR and below or:
**Heavy Duty Emissions with 8501 GVWR and above
?Throttle Body Injection
Engine Emissions Classification
-
Diesel Engines
Engine
Type
VIN
Fuel System
Emissions
6.5L
V8
P
Diesel
LD
6.5L
V8
S
Turbo Diesel
LD
6.5L
V8
F
Turbo Diesel
HD
7-4