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1964 Cylinder Head Applications & Casting Numbers
1965 Cylinder Head Applications & Casting Numbers
1966 Cylinder Head Applications & Casting Numbers
1967 Cylinder Head Applications & Casting Numbers
1968 Cylinder Head Applications & Casting Numbers
1969 Cylinder Head Applications & Casting Numbers
1970 Cylinder Head Applications & Casting Numbers
1971 Cylinder Head Applications & Casting Numbers
1972 Cylinder Head Applications & Casting Numbers
1973 Cylinder Head Applications & Casting Numbers
1974 Cylinder Head Applications & Casting Numbers

The head casting number can often be found on top of the center exhaust port. In some cases it may be located on one of the end exhaust ports. These are usually easy to read by looking down from the valve cover. On some heads you may have to remove the valve cover to find the entire casting number and or the casting date.

1964 GTO Cylinder Head Applications & Casting Numbers

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Application

Casting Number

4-BBL

9770716

3X2

9770716

1965 GTO Cylinder Head Applications & Casting Numbers

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Application

Casting Number

4-BBL

9778777

3X2

9778777

Replacement

093

1966 GTO Cylinder Head Applications & Casting Numbers

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Application

Casting Number

4-BBL

093

3X2

093

1967 GTO Cylinder Head Applications & Casting Numbers

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Application

Casting Number

2-BBL

9788064

4-BBL

670

Ram Air

97

1968 GTO Cylinder Head Applications & Casting Numbers

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Application

Casting Number

2-BBL

9792266

4-BBL

16

Ram Air I

37

Ram Air II

96

1969 GTO Cylinder Head Applications & Casting Numbers

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Application

Casting Number

2-BBL

9792266

4-BBL A/T

62 or 16

4-BBL M/T

48 or 62

Ram Air III A/T

48 or 16

Ram Air III M/T

48

Ram Air IV

722

1970 GTO Cylinder Head Applications & Casting Numbers

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Application

Casting Number

4-BBL A/T

13

4-BBL M/T

12

Ram Air III(All)

12

Ram Air IV

614

455 H.O. (All)

64

1971 GTO Cylinder Head Applications & Casting Numbers

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Application

Casting Number

400 4-BBL (All)

481196 or 96

455 4-BBL

481776 or 66

455 H.O.(All)

481197,197,191

1972 GTO Cylinder Head Applications & Casting Numbers

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Application

Casting Number

400 4-BBL

486073,7K3

455 4-BBL

486075,7M5

455 H.O.

486076,7F6

1973 GTO Cylinder Head Applications & Casting Numbers

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Application

Casting Number

400 4-BBL

488543,4X

455 4-BBL

488541,4X

455 4-BBL

494341,4X

1974 GTO Cylinder Head Applications & Casting Numbers

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Application

Casting Number

350 4-BBL

494345

350 4-BBL

494346

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