MG MGA Twin Cam Workshop Manual page 20

GENERAL INFORMATION-continued
POWER UNIT SERIAL NUMBER CODING
The engine number on later engines comprises a series of letters and numbers, presenting in code the capacity
make, and type of unit. ancillaries fitted, and the type of compression together with the serial number of the unit.
1st PREFIX GROUP-Cubic capacity, make, and type
1st Prefix number 8-803 c.c.
9~950 c.c.
12-1200 c.c.
15~1500 c.c.
16--1600 c.c.
22~2200 c.c.
25~2500 c.c.
26-2600 c.c.
I st Prefix letter
B~B.M.C.
Industrials
G-M.G.
H-Miscellaneous special
J-Commercial
M~Morris
R-Riley
W-Wolseley
2nd Prefix letter A-Z used for the variations of engine type
2nd PREFIX GROUP-Gearbox and Ancillaries
A~Automatic gearbox
M-Manumatic clutch
N~Steering
column gear change gearbox
0-0verdrivc (Borg-Warner)
P-Police specification
U~Centre gear change gearbox
3rd GROUP-Compression and serial number
H-High compression
I
J
and serial number of unit
L-Low compression
CODE EXAMPLE
16G/U/123456
General Information 8
Number
Gear Change Gearbox
c.c. 'MGA'