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.
|
Application |
Casting Number |
|---|---|
|
4-BBL |
9770716 |
|
3X2 |
9770716 |
1965 GTO Cylinder Head Applications & Casting Numbers
|
Application |
Casting Number |
|---|---|
|
4-BBL |
9778777 |
|
3X2 |
9778777 |
|
Replacement |
093 |
1966 GTO Cylinder Head Applications & Casting Numbers
|
Application |
Casting Number |
|---|---|
|
4-BBL |
093 |
|
3X2 |
093 |
1967 GTO Cylinder Head Applications & Casting Numbers
|
Application |
Casting Number |
|---|---|
|
2-BBL |
9788064 |
|
4-BBL |
670 |
|
Ram Air |
97 |
1968 GTO Cylinder Head Applications & Casting Numbers
|
Application |
Casting Number |
|---|---|
|
2-BBL |
9792266 |
|
4-BBL |
16 |
|
Ram Air I |
37 |
|
Ram Air II |
96 |
1969 GTO Cylinder Head Applications & Casting Numbers
|
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
|
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
|
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
|
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
|
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
|
Application |
Casting Number |
|---|---|
|
350 4-BBL |
494345 |
|
350 4-BBL |
494346 |