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                    Engine Codes

1967

Pontiac 400:  WI, WQ, WU, WZ (manual), YT, XN (automatic)

1968

Pontiac 400:  WZ (manual), YT (automatic)

Pontiac 400 HO:  WQ (Manual), YW (automatic)

Pontiac 400 Ram Air:  XN, XT (automatic), WU, WI (manual)

1969

Pontiac 400:  WZ (manual), YT (automatic)

Pontiac 400 Ram Air III:  WQ (manual), YW (automatic)

Pontiac 400 Ram Air IV:  WH (manual), XN (automatic)

1970

Pontiac 400:  WK, WS, WT (manual), XX, YS, YX (automatic)

Pontiac 455:  WC, WJ, WL (HO) (manual), YC, YE (HO) (automatic)

1971

Pontiac 400:  WK, WS, WT (manual), XX, YS, YX (automatic)

Pontiac 455:  WC, WJ, WL (manual), YC, YE (automatic)

1972

Pontiac 400:  WK (manual), YS, YX, ZS, ZX (automatic)

Pontiac 455:  WD, WM (manual), YB, YE (automatic)

1973

Pontiac 400:  WK, WP, WS, Y6, YG (manual), Y3, XN, YS, YX, YZ, ZK, ZX (automatic)

Pontiac 455:  WT, WW (manual), YA, YC, YD, YK (automatic)

Pontiac 455 SD:  W8 (manual), Y8 (automatic)

1974

Pontiac 400:  WT, Y3 (manual), AD, AH, AT, YT, YZ, YF, YH, ZJ, ZK, YL, YM, A3, YT, AT, ZS, ZT (automatic)

Pontiac 455:  AU, YW, YY (automatic)

Pontiac 455 SD:  W8 (manual), Y8 (automatic)

1975

Pontiac 400:  WT (manual), YS (automatic)

Pontiac 455:  WZ (manual)

1976

Pontiac 400:  Y9, YS, YZ, ZK, Y9 (automatic)  WU, WT (manual)

Pontiac 455:  WX

1977

L78 Pontiac 400:  XA

W72 Pontiac 400:  Y6, YG (automatic)  WA (manual)

Olds 403:  VA, VB, U2, U3

1978

L78 Pontiac 400:  YA, YU

W72 Pontiac 400:  X7, WC

Olds 403:  VA, VB, U2, U3

1979

W72 Pontiac 400:  PWH (manual only)

Olds 403:  Q6, QE, QJ, QK, QL

Pontiac 301:  X4, X6

1980

Pontiac 301:  XC, XM, XN, YN

Pontiac 301 Turbo: YL

Chevy 305:  CEL, CEM

scroll down for yearly production numbers

1981

Pontiac 301:  BD, BJ

Pontiac 301 Turbo: BO, CJ

Chevy 305:  D6A, D6B, D6D, DHA, DHB, DHC, DHD, DHF, DHH, DHJ, DHK, DHU, DHZDJ, DKB, DND

                  Production Figures:

Find here some figures that I found over the years, taken from different sources, I found they are  pretty accurate

1969 Breakdown:
Option
Manual
Auto
Total
Coupe RamAir III
520
114
634
Convertible RamAir III
4
4
8
Coupe RamAir IV
46
9
55
Total Production
697

 
1970 Breakdown:
Option
Manual
Auto
Total
RamAir III
1,769
1,339
3,108
RamAir IV
59
29
88
Total Production
3,196

 
1971 Breakdown:
Option
Manual
Auto
Total
455 H.O.
885
1,231
2,116
Total Production
2,116

 
1972 Breakdown:
Option
Manual
Auto
Total
455 H.O.
458
828
1,286
Total Production
1,286

 
1973 Breakdown:
Option
Manual
Auto
Total
455
1,420
3,130
4,550
SD - 455
72
180
252
Total Production
4,802

 
1974 Breakdown:
Option
Manual
Auto
Total
400
1,750
2,914
4,664
455
0
4,648
4,648
SD - 455
212
731
943
Total Production
10,255

 
1975 Breakdown:
Option
Manual
Auto
Total
400
6,140
20,277
26,417
455 H.O.
857
0
857
Total Production
27,274

 
1976 Breakdown:
Option
Manual
Auto
Total
400
¨
¨
37,015
L.E. 400
¨
¨
1,628
T-Top L.E. 400
¨
¨
533
455 H.O.
7,099
0
7,099
SE 455 H.O.
319
0
319
T-Top L.E 455 H.O.
110
0
110
Total Production
46,701

 
1977 Breakdown:
Option
Manual
Auto
Total
L78
0
29,313
29,313
L80
0
5,079
5,079
W72
8,319
10,466
18,785
S.E. L78
0
748
748
S.E. L80
0
180
180
S.E. W72
384
549
933
S.E. L78 w/ T-Tops
0
6,030
6,030
S.E. L80 w/ T-Tops
0
1,217
1,217
S.E. W72 w/ T-Tops
2,699
3,760
6,459
Total Production
68,745*

 
.
1979 Breakdown:
Option
Manual
Auto
Total
301
1,590
7,015
8,605
403
0
48,488
48,488
400
2,485
0
2,485
T-Top 301
1,530
3,301
4,831
T-Top 403
0
30,728
30,728
T-Top 400
2,917
0
2,917
S.E. 301
213
360
573
S.E. 403
0
9,874
9,874
S.E. 400
1,107
0
1,107
10th Anniversary 403
0
5,683
5,683
10th Anniversary 400
1,817
0
1,817
Total Production
117,108

 
1980 Breakdown:
Option
Manual
Auto
Total
301
0
14,866
14,866
305
0
1,653
1,653
301 Turbo
0
5,753
5,753
T-Top 301
0
8,692
8,692
T-Top 305
0
896
896
T-Top 301 Turbo
0
7,176
7,176
S.E. 301
0
72
72
S.E. 305
0
12
12
S.E. 301 Turbo
0
103
103
S.E. T-Top 301
0
2,084
2,084
S.E. T-Top 305
0
463
463
S.E. T-Top Turbo
0
3,444
3,444
Indy Pace Car Turbo
0
5,700
5,700
Total Production
50,896

 
1981 Breakdown:
Option
Manual
Auto
Total
301
0
5,087
5,087
305
2,866
0
2,866
301 Turbo
0
3,851
3,851
T-Top 301
0
4,589
4,589
T-Top 305
3,225
0
3,225
T-Top 301 Turbo
0
6,612
6,612
S.E. 301
0
41
41
S.E. 305
15
0
15
S.E. 301 Turbo
0
65
65
S.E. T-Top 301
0
1,160
1,160
S.E. T-Top 305
932
0
932
S.E. T-Top Turbo
0
3,050
3,050
Turbo Pace Car
0
2,000
2,000
Total Production
33,493