Cylinder head casting number usage

1964
326/250 hp
326/280 hp
389/215, 230, 235 hp
389/267, 283, 303, 306 hp
389/325, 330, 348 hp
421/320 hp
421/350, 370 hp

1965
326/250 hp
326/285 hp
389/256 hp
389/290, 325, 333 hp
389/335, 338, 360 hp
421/338 hp
421/356, 376 hp
NOTE: All casting #s are on end port.

1966
230/165 hp
230/207 hp
326/250 hp
326/285 hp
389/256 hp
389/290, 325, 333 hp
389/335, 360 (GTO) hp
421/338, 350 hp
421/356, 376 hp

1967
230/165 hp
230/215 hp
326/250 hp
326/285 hp
400/255,
260, 265 hp
400/290 hp
400/325, 333 hp
400/350 hp
(Grand Prix)
400/325, 335, 360 hp
400/325, 360 hp,
Ram Air
428/360, 376 hp

1968
250/175 hp
250/215 hp
350/265 hp
350/320 hp
400/265 hp
400/290, 340 hp
400/350 hp
(Grand Prix)
400/330 hp
(Firebird)
400/335, 350, 360 hp
400/335, 360 hp
Ram Air
400/340, 366
hp Ram Air
428/375 hp
428/390 hp

1969
250/175 hp
250/215, 230 hp
350/265 hp
350/325 hp
400/265 hp
400/290 hp
400/340 hp

9773345, (845)
9773395
543796
9773345,(845)
9770716
9773345,(845)
9770716

62
22
75
76
77
76
77

9782005
9782229
094
095
091
092
093
092
093

9778692
9778693
140
141

142
143, 061
143, 061

670,9787671,187
670

670,97, 997
670, 9787671

9791194
9791195
17
18
14
15, 215

16, 216, 62

16, 216, 62
16, 62

31 (37)

R, 96, A
16, 216, 62
16, 216, 62

9795456
9795457
47
48
45
46

1969
400/330, 335,
350, 366 hp
400/345, 370 hp
Ram Air IV*
428/360 hp
428/370 hp
428/390 hp
400/375 hp (Ram Air V)
*NOTE: Cast # on end port.

1970
350/255 hp
400/265 hp
400/290 hp
400/330 hp
400/330 hp
400/330 hp
400/335,366 hp
(Ram Air III)
400/350 hp
(Grand Prix)
400/350 hp (GTO)
400/350 hp (GTO)
400/345,370 hp
Ram Air IV*
455/360 hp
(B-body)
455/360, 370 hp
*NOTE: Cast # is on
the end port.

1971
350/250 hp
400/265 hp
400/300 hp
455/280 hp
455/325 hp
455 H.O./335 hp*
*NOTE: Cast # is on
the end port.

1972
350/175 hp
400/200 hp
400/250 hp
455/200 hp
455/250 hp
455 H.O./300 hp

1973
350/150, 175 hp
400/170, 185 hp
400/200 hp
400/230 hp
455/215, 250hp
455-SD/290 hp
** NOTE: Screw-in studs.

1974
350/155, 170 hp
350/200 hp
400/175, 190 hp
400/200 hp
400/225 hp
400/225 hp
** NOTE: Screw-in studs.

16, 62, 48

722, 9796722
16(Sm.valve)
62
16, 62
44

11, 47
11, 47
16 Sm. valve
16 Sm. valve
12 (M/T)
13 (A/T)

12

13
12 (M/T)
13 (A/T)

614

15
(GTO, GP,
and B-body)

94
99
96
98
66
197

7H1
7J2
7K3
7L4
7M5
7F6

46, 4C
46, 4C
4X, 4C
4X**
4X**
16, 485216**

46, 4C
46** (GTO)
46, 4C
4X, 4C
4X**4C (A/T)
4X**4C (M/T)