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
AUTOMATIC SUFFIX CODE:
BF - 230ci/140HP base L6 *
CQ - 250ci/155HP L22 L6
CR - 250ci/155HP L22 L6 *
EE - 327ci/275HP L30
EN - 327ci/275HP L30
ME - 327ci/210HP base V8
MR - 396ci/350HP L34
MU - 350ci/295HP L48
MY - 396ci/325HP L35
MANUAL SUFFIX CODE:
BA - 230ci/140HP base L6
BD - 230ci/140HP base L6 *
CM - 250ci/155HP L22 L6
CN - 250ci/155HP L22 L6 *
EA - 327ci/275HP L30
MA - 327ci/210HP base V8
MO - 302ci/290HP Z28
MQ - 396ci/375HP L78
MS - 350ci/295HP L48
MT - 396ci/375HP L89
MW - 396ci/325HP L35
MX - 396ci/350HP L34
* Cars with A/C
CASTING NUMBERS:
ENGINE BORE CASTING#
L6 3.875" 3921968
327 4.0" 3914660 / 3914678
302/350 4.0" 3914678
396 4.094" 3916323 / 3935440
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)
REAR AXLE CODES:
AXLE CODE:
BA - 2.56:1
BB - 2.56:1 posi
BI - 2.73:1
BL - 3.07:1
BN - 3.55:1
BP - 2.73:1
BQ - 2.73:1 posi
BR - 3.07:1 posi
BS - 3.31:1 posi
BT - 3.55:1 posi
BU - 3.73:1 posi
BV - 4.10:1 posi
BW - 4.56:1 posi
BX - 4.88:1 posi
BY - 2.73:1 posi
BZ - 2.73:1
PB - 3.31:1
PE - 3.08:1 posi
PG - 3.37:1 posi
PH - 3.55:1 posi
PK - 3.55:1
PN - 2.56:1
PO - 2.56:1 posi
PP - 3.07:1
PR - 3.31:1 posi
PX - 2.73:1 posi
Q2 - 3.55:1
Q3 - 3.55:1 posi
QD - HD 4.56:1 posi (COPO "MV" special - 427 only)