ENGINE CODES:
The engine code/stamp identifies the engine assembly plant, assembly date, and engine suffix code stamped by the engine plant. It is located on a machined pad on the engine block. On a V8, you will find the pad on the passenger's side of the engine block at the bottom of the forward end of the head. On a 6 cylinder engine, you will find the pad on the passenger's side of the block towards the forward end near the distributor.
The Engine code format is FMMDDXX. This breaksdown as follows:
F - Is the Engine Factory Code. This will be one of the following:
F = Flint, MI Motor Facility for 6 cylinder engines
V = Flint, MI Engine Plant for 8 cylinder engines
T = Tonawanda, NY Engine Plant
MM - Month of the year:
01-12
DD - Day of the month:
01-31
XX - Suffix Code:
refer to the codes below
POWERGLIDE: AUTOMATIC (TH350): MANUAL SUFFIX CODE:
AN - 230ci/140HP base L6 AR - 230ci/140HP base L6 * AM - 230ci/140HP base L6 @
AQ - 230ci/140HP base L6 * AO - 230ci/140HP base L6 AP - 230ci/140HP base L6 *#
AT - 230ci Export BD - 250ci/155HP L22 L6 AS - 230ci Export @
AV - 230ci Export * BH - 250ci/155HP L22 L6 * AU - 230ci Export *#
BB - 250ci/155HP L22 L6 DD - 307ci/200HP base V8 BE - 250ci/155HP L22 L6 @
BC - 250ci/155HP L22 L6 * FL - 327ci/210HP base V8 BF - 250ci/155HP L22 L6 *#
DC - 307ci/200HP base V8 HD - 350ci/250HP L65 DA - 307ci/200HP base V8 #
FK - 327ci/210HP base V8 HS - 350ci/255HP LM1 DE - 307ci/200HP base V8 @
FT - 327ci Export HB - 350ci/300HP L48 FJ - 327ci/210HP base V8 #
HF - 350ci/250HP L65 FZ - 327ci/210HP base V8 @
HR - 350ci/255HP LM1 AUTOMATIC (TH400): FS - 327ci Export
HE - 350ci/300HP L48 JG/CJG - 396ci/325HP L35 HC - 350ci/250HP L65
JI/CJI - 396ci/350HP L34 HQ - 350ci/255HP LM1
JL/CJL - 396ci/375HP L78 HA - 350ci/300HP L48
JM/CJM - 396ci L78, L89 Heads DZ - 302ci/290HP Z28
MM - 427ci/425HP L72 COPO 9561 JB/CJB - 396ci/325HP L35
MO - 427ci/425HP ZL1 COPO 9560 JF/CJF - 396ci/350HP L34
JH/CJH - 396ci/375HP L78
* Cars with A/C JJ/CJJ - 396ci L78, L89 Alum Heads
# 3-Speed MN - 427ci/425HP L72 COPO 9561 @
@ 4-Speed ML - 427ci/425HP ZL1 COPO 9560 @
CASTING NUMBERS:
ENGINE BORE CASTING#
L6 3.875" 3921968
307 3.875" 3932371 / 3956632
327 4.0" 3932386 / 3932388
302/350 4.0" 3970010 / 3970014
396 4.094" 3935440 / 3955272 / 3969854
427 4.251" 3963512
TRANSMISSION CODES:
The transmission code for 1967-1969 all used the same format.
TYMDDS which breaks down as follows:
T - Transmission Type which included:
Manuals: Automatics:
S - Saginaw 3-speed A - 68/69 L6 Torque-Drive
K - McKinnon 3-speed C - Cleveland Powerglide
H - 69 Muncie HD 3-speed T - Toledo Powerglide
R - 4-speed Saginaw B - Cleveland TH350
P - 4-speed Muncie X - Cleveland TH350
Y - Toledo TH350
Y - Model Year:
7 - 1967
8 - 1968
9 - 1969
M - Month:
A - January K - July
B - Februay M - August
C - March P - September
D - April R - October
E - May S - November
H - June T - December
DD - Day of the Month:
01-31
S - Suffix Code:
PowerGlide and TH350 (not used on all):
D - day shift
N - night shift
1969 Muncie 3-speed
B - 2.42 first gear ratio
1969 Muncie 4-speed only:
A - M20
B - M21 (use of the Muncie type suffix)
C - M22 (began with 21 Oct 68 production)