Engine Identification - Chevrolet LIGHT DUTY TRUCK (SERIES 10-35) Service Manual

The following information is important in
NOTICE:
preventing engine damage and in providing reliable
engine performance. When raising or supporting the
engine for any reason, do not use a jack under the oil
pan, any sheet metal or crankshaft pulley. Due to the
small clearance between the oil pan and the oil pump
screen, jacking against the oil pan may cause it to be
bent against the pump screen, resulting in a damaged oil
pickup unit.
Engine Identification................................................................. 6A-1
Diagnosis................................................................................... 6A-3
4.1 (D) L
4.8 (T) L
5.0 (U) V
5.7 (L) V
6.6
7.4 (S) V
5.7
All engines used in 1979 are referred to by their litre
displacement followed by the VIN code letter in parenthesis.
This VIN code can be found on the vehicle by observing the
VIN plate located on the left door striker pillar. The third
character in the VIN code identifies the engine (fig. 6A-1).
All engines have a portion of the VIN number and a
build date code stamped on the cylinder case.
The -cylinder stamping is on the right hand side on
6
the distributor pad. An optional code location is at the left
rear of the cylinder and case on the bellhousing/converter
housing mounting surface (Fig. 6A-2).
Small block 8 -cylinder engines have the stamping on
top front of right hand bank of cylinder and case. The
optional location is rear of the oil filter on the left side of
the engine (Fig. 6A-2).
The Mark IV 8 -cylinder engines (big block) have the
same stamping locations as the small blocks with the
addition of a stamping location in front of the engine, above
the timing chain cover (Fig. 6A-3).
SECTION 6A
EN G IN E M E C H A N IC A L
C ON TE N TS
-6 - RPO LE3............................................................
- RPO L25............................................................. 6A1-1
-6
-8 - RPO LG9...........................................................
-8 - RPO LS9............................................................ 6A4-1
(R) V - RPO LF4............................................................ 6A4-1
-8
-8 - RPO LF 8 ............................................................. 6A5-1
V -8 - RPO LF9.............................................................. 6A6-1
(Z )

ENGINE IDENTIFICATION

ENGI NE M E C H A N I C A L
It should be kept in mind, while working on the engine,
that the 12 - volt electrical system is capable of violent
and damaging short circuits. When performing any work
where electrical terminals could possibly be grounded,
the ground cable of the battery should be disconnected
at the battery. Any time the carburetor or air cleaner is
removed,the intake opening should be covered. This will
protect against accidental entrance of foreign material
which could follow the intake passage into the cylinder
and cause extensive damage when the engine is started.
6A1-1
6A4-1
T H IR D C H A R A C T E R IS
EN G IN E CODE
♦
C C D 1 4 9 1 1 0 0 0 0 1
CARB
CODE RPO TYPE BA R R E LS
D LE3 L6 2
L6
T L25 1
U LG 9 V8 2
V8
L L.S9 4
R LF4 V8 4
V8 4
S LF8
z
LF9 V8
F.I.*
Diesel
* - Fuel Injected
Fig. 6A-1--Engine Codes
6A-1
D ISPLAC EM EN T
SECTION
LIT R E /C U . IN.
4.1/250 6A1
6A1
4.8/292
6A4
5.0/305
6A4
5.7/350
6A4
6.6/400
6A5
7.4/454
5.7/350 6A6
LIGHT T R U CK SER V IC E MANUAL