PONTIAC HIGH PERFORMANCE CYLINDER HEADS

Year(s)

App.

Prod. #

Orignal part#

Head Cast#

Valve Sizes

Stock C.C.

NHRA min C.C.

1960

389SD

535460

535461

535461

1.92/1.60

68

66.8

1961-62

389SD
421SD

540304

540306

40306

1.92/1.66

68

66.8

1962-63

389SD
412SD

544124

544127

544127

2.02/1.76

68

66.8

1963

421SD

9771983

9771980

9771980

2.02/1.76

65 .6

64.0 (FX)

1963-64

421 HO
389 GTO

9770981

9770716

9770716

1.92/1.66

68

66.8/66.0

1965

389

9781078

9778775

75

1.92/1.66

92/68

90/68

421
389 GTO

9781079

9778776

76

1.92/1.66

70/68

68/65

421 HO

9781081

9778777

77

1.92/1.66

68

65

1966

389

421

9784209

9782092

092

1.92/1.66

70

68

389GTO
421 HO

9784212

9782093

093

1.92/1.66

68

65

1967

400
428

9788067

9787670,1

670

2.11/1.77

72

65

400 (RA)

9787997

9787997

97

2.11/1.77

72

65

1968

400
428

9791559

9791562

62

2.11/1.77

75/72

65

400
428

9790118

9791216

(2)16

2.11/1.77

72

65

400RA
(RA I)

9792700

9792731

31

2.11/1.77

72

65

400RA
(RAII)

9794040

9793596

96

2.11/1.77

71

65

1969

400
428

9790118

9791216

16

2.11/1.77

72

65

400

9791559

9791562

62

2.11/1.77

72

65

400
(RA III)

9795043

9795048

48

2.11/1.77

72

65

400
(RAIV)

9796721

9796722

722

2.11/1.77

71

65

1970

400
(RAIII)

9799496

9799612

12

2.11/1.77

72

65/62

400

9799497

9799613

13

2.11/1.77

72

65/62

400
(RA IV)
(LS-1)

9799498

9799614

614

2.11/1.77

71

62

455

9799362

9799364

64

2.11/1.77

87

75

1971

400

481760

481196

96

2.11/1.77

96

85.8

455

483714

481766

66

2.11/1.77

114

102.8/101.8

455 HO
(LS-5)

481758

481197

197

2.11/1.77

111

98

1972

400

486316

486073

7K3

2.11/1.77

96

85.8

455

494498

486075

7M5

2.11/1.77

114

101.8

455 HO
(LS-5)

485319

486076

7F6

2.11/1.77

111

98

1973-74

400

494333

488534

4X

2.11/1.66

98

88.2

1973-74

455

494331

488541

4X

2.11/1.66

114

102.3

1974

350 GTO

494336

494346

46

1.96/1.66

89

86.2

1973-74

455SD
(LS-2)

485214

485216

16

2.11/1.77

111

100.7

1975

400

495345

495354

5C

2.11/1.66

101

98.09

1976-79

400

500801

500762

6X

2.11/1.66

101

98.09,89.06(79)