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ENGINE CODES
 

AMERICAN MOTORS

Engine Number Build dates
 
1960
1
Code Prefix
1961-62
Code Prefix
6-196
Side valves, 90hp, 8:1, 1brl
 A 6-196
90hp, 8.0:1, 1brl
 A
6-196
Overhead valves, 127hp, 8.7:1, 1 brl
 C
7
 6-196
125hp, 8.7:1, 1brl
 B
8-327
250hp, 8.7:1, 2brl
 E 6-196
127hp, 8.7:1, 1brl
 C
7
8-327
270hp, 9.7:1, 4brl
 F 8-327
250hp, 8.7:1, 2brl
 E
  8-327
270hp, 9.7:1, 4brl
 F
 
1963
1
1964
6-196
90hp, 8:1, 1brl
 A 6-196
90hp, 8.0:1, 1brl
 A
6-196
125hp, 8.7:1, 1 brl
 B,C 6-196
125hp, 8.7:1, 1brl
 B
6-196
138hp, 8.7:1, 2brl
 B,C 6-196
138hp, 8.7:1, 2brl
 B
8-327
250hp, 8.7:1, 2brl
 E 6-196
127hp, 8.7:1, 1brl
 C
8-327
270hp, 9.7:1, 4brl
 F 6-196
138hp, 8.7:1, 2brl
 C
8-327
198hp, 8.7:1, 2brl
 G 8-327
250hp, 8.7:1, 2brl
 E
    8-327
270hp, 9.7:1, 4brl
 F
1962-65
8
Size Code
9
 6-232
145hp, 8.5:1, 1brl
 L
Standard A 8-287
198hp, 8.7:1, 2brl
 G
.010"
under
 B 8-327
250hp, 8.7:1, 2brl
 E
.010"
over
 C 8-327
270hp, 9.7:1, 4brl
 F
 
1965
1, 2
1966
1, 2, 4
6-196
90hp, 8:1, 1brl
 A 8-327
250hp, 8.7:1, 2brl
 E
6-196
125hp, 8.7:1, 1brl
 B 8-327
270hp, 9.7:1, 4brl
 F
6-196
138hp, 8.7:1, 2brl
 B 8-287
198hp, 8.7:1, 2brl
 G
8-327
270hp, 9.7:1, 4brl
 F V8-290
200hp, 9.7:1, 4 brl
 H
8-287
198hp, 8.7:1, 2brl
 G 6-199
128hp, 8.5:1, 1brl
 J
6-199
128hp, 8.5:1, 1brl
 J 6-232
145hp, 8.5:1, 1brl
 L
6-232
145hp, 8.5:1, 1brl
 L 6-232
155hp, 8.5:1, 2brl
 L
6-232
155hp, 8.5:1, 2brl
 L 8-290
225hp, 10:1, 4brl
 N
 
1967
1, 2, 4
1968
1, 2, 4
V8-290
200hp, 9:1, 2 brl
 H V8-290
200hp, 9:1, 4 brl
 H
6-199
128hp, 8.5:1, 1brl
 J 6-199
128hp, 8.5:1, 1 brl
 J
6-232
145hp, 8.5:1, 1 brl
 L 6-232
145hp, 8.5:1, 1 brl
 L
6-232
155hp, 8.5:1, 2 brl
 L 6-232
155hp, 8.5:1, 2 brl
 M
8-290
225hp, 10:1, 4 brl
 N 8-290
225hp, 10:1, 4 brl
 N
V8-343
280hp, 10.2:1, 4 brl
 Z 6-199
128hp, 8.5:1, 1 brl
 P
  V8-343
235hp, 9:1, 2 brl
 S
V8-390
425hp, 11.2:1, 4 brl
 W
6
V8-343
280hp, 10.2:1, 4 brl
 Z
 
1969
4
1970
2, 5
V8-290
200hp, 9:1, 2 brl
 H 6-199
128hp, 8.5:1, 1 brl
 A
6-199
128hp, 8.5:1, 1 brl
 J, P 6-199
1brl
 B
6-232
155hp, 8.5:1, 2 brl
 L 6-232
145hp, 8.5:1, 1 brl
 E
6-232
145hp, 8.5:1, 1 brl
 M 6-232
1 brl
 F
8-290
225hp, 10:1, 4 brl
 N 6-232
155hp, 8.5;1, 2 brl
 G
V8-343
235hp, 9:1, 2 brl
 S V8-304
210hp, 9:1, 2 brl
 H
V8-390
315hp, 10.2:1, 4 brl
 W
6
 V8-304
2 brl
 I
V8-390
325hp, 10:1, 4 brl
 X 8-360
245hp, 9:1, 2 brl
 N
V8-343
280hp, 10.2:1, 4 brl
 Z 8-360
290hp, 10:1, 4 brl
 P
  6-232
2 brl
 Q
V8-390
325hp, 10:1, 4 brl
 X
V8-390
340hp, 10:1, 4 brl
 X
 
1971
3, 5
1972-73
3, 5
6-258
150hp, 8:1, 1 brl
 A 6-258
110hp, 8:1, 1 brl
 A
6-258
1 brl
 B 6-258
1 brl
 B
6-232
135hp, 8:1, 1 brl
 E 6-232
100hp, 8:1, 1 brl
 E
6-232
1 brl
 F 6-232
1 brl
 F
V8-304
210hp, 8.4:1, 2 brl
 H V8-304
150hp, 8.4:1, 2 brl
 H
V8-304
2 brl
 I V8-304
2 brl
 I
V8-360
245hp, 8.5:1, 2 brl
 N V8-360
175hp, 8.5:1, 2 brl
 N
V8-360
285hp, 8.5:1, 4 brl
 P V8-360
195hp, 8.5:1, 4 brl
 P
10
V8-401
330hp, 9.5:1, 4 brl
 Z V8-401
255hp, 8.5:1, 4 brl
 Z
 
1974-75
3, 5
  
6-258
110hp, 8:1, 1 brl
 A  
6-232
100hp, 8:1, 1 brl
 E
V8-304
150hp, 8.4:1, 2 brl
 H
V8-360
175hp, 8.25:1, 2 brl
 N
V8-360
195hp, 8.25:1, 4 brl
 P
11
V8-401
255hp, 8.25:1, 4 brl
 Z
 
 

Location:

1- 6-196 Located on machined surface, upper left corner of engine block.

2- 1965-70 Located on machined surface adjacent the distributor.

3- 232 & 258 Located on pad between #2 and #3 cylinders.

287 & 327 tag attached alternator mounting bracket.

4- 1966-69 Located on plate attached to front right-hand rocker arm cover.

5- 1970-75 Located on plate attached to right bank rocker arm cover.

6- "W" denote 4 Bar. Carb 1969, "X" 1968

7- Optional 138hp@4500 rpm with 2brl carb

8- Machined oversize or undersize

9- 3 letter code stamp below the engine code. 1st bore, 2nd main bearing, 3rd rod bearing

10- "P" with dual exhaust 220hp, 8.5:1, 4 brl

11- "P" with dual exhaust 220hp, 8.25:1, 4 brl
 
The engine code decoder reveals the stamp location, engine displacement, horse power, compression ratio, and Carburetor configuration.