1964 GTO Engine Codes & Production Totals

 

 

Engine C.I.D

Carb. Type

Trans. Type

Std. Code

Compression Ratio

Horsepower

389

3X2

3-SPD

76X

10.75:1

348

389

3X2

4-SPD

76W

10.75:1

348

389

3X2

4-SPD1

76XW

10.75:1

348

389

3X2

4-SPD2

769

10.75:1

348

389

3X2

AUTO.

77J

10.75:1

348

389

4BBL

3-SPD

78X

10.75:1

325

389

4BBL

4-SPD1

78W

10.75:1

325

389

4BBL

4-SPD1

78XW3

10.75:1

325

389

4BBL

4-SPD2

789

10.75:1

325

389

4BBL

AUTO.

79J

10.75:1

325

Special Notes:
1 4spd.M-20 Wide Ratio
2 4spd.M-21 Close Ratio
3 To use left over 3-spd. blocks the factory stamped a letter (W) after the (X) to mark them as 4-spd. blocks.

 

 

1964 GTO Production Totals

Convertible

6,644

Coupe

7,384

Hardtop

18,422

 

 

Total Production

32,450

 

 

389 3x2 Engine

8,245

389 4-BBL Engine

24,205

 

 

 

 

 

 

 

 

 

1965 GTO Engine Codes & Production Totals

 

 

Engine C.I.D

Carb. Type

Trans. Type

Std. Code

Compression Ratio

Horsepower

389

3X2

MAN.

WS

10.75:1

360

389

3X2

AUTO.

YR

10.75:1

360

389

4BBL

MAN.

WT

10.75:1

335

389

4BBL

AUTO.

YS

10.75:1

335

 

 

Special Notes:
Although never shown in production figures, there were over the counter, and possibly dealer installed ram air packages sold for the 1965 GTO.

A 421 cubic inch motor could be ordered and dealer installed in a 65 GTO, but there were no factory built 421 GTO`s. A fully documented 421 GTO is very desirable and extremely rare. If not documented this application is incorrect.

 

 

1965 GTO Production Totals

Convertible

11,311

Coupe

8,319

Hardtop

55,722

 

 

Total Production

75,352

 

 

389 3X2

20,547

389 4BBL

54,805

 

 

Manual

56,378

Automatic

18,974

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1966 GTO Engine Codes & Production Totals

 

 

Engine C.I.D.

Carb. Type

Trans. Type

Std. Code

Calif. Code

Compression Ratio

Horsepower

389

4BBL

MAN

WT

WW

10.75:1

335

389

4BBL

AUTO

YS

XE

10.75:1

335

389

3X2

MAN

WS

WV

10.75:1

360

389

3X2

AUTO

YR

YR

10.75:1

360

389

3X2

MAN(RA) 1

XS

XS

10.75:1

360

 

Special Notes:
1 Although never shown in production figures there were approximately 25 to 35 factory built 1966 ram air GTO`s (XS package). It is estimated that 300 dealer ram air packages were sold for 66 GTO`s.

A 421 cubic inch motor could be ordered and dealer installed in a 66 GTO, but there were no factory built 421 GTO`s. A fully documented 421 GTO is very desirable and extremely rare. If not documented this application is incorrect.

 

1966 GTO Production Totals

Convertible

12,798

Coupe

10,363

Hardtop

73,785

 

 

Total Production

96,946

 

 

389 3X2

19,045

389 4BBL

77,901

 

 

Manual

61,279

Automatic

35,667

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1967 GTO Engine Codes & Production Totals

 

 

Engine C.I.D.

Carb. Type

Trans. Code

Std. Code

Calif. Code

Compression Ratio

Horsepower

400

4-BBL

3-SPD. MAN

WT

WW

10.75:1

335

400 H.O.

4-BBL

3-SPD.MAN

WS

WV

10.75:1

360

400

4-BBL

4-SPD. MAN

WT

WV

10.75:1

335

400 H.O.

4-BBL

4-SPD. MAN

WS

WV

10.75:1

360

400 R.A.

4-BBL

4-SPD. MAN

XS

YR

10.75:1

360

400

4-BBL

AUTO.

YS

YS

10.75:1

335

400

2-BBL

AUTO.

XM

XL

8.60:1

255

400 H.O.

4-BBL

AUTO.

YZ

YZ

10.75:1

360

400 R.A.

4-BBL

AUTO.

XP

XP

10.75:1

360

 

Special Note:
A 428 cubic inch motor could be ordered and dealer installed in a 67 GTO, but there were no factory built 428 GTO`s. A fully documented 428 GTO is very desirable and extremely rare. If not documented this application is incorrect.

 

1967 GTO Production Totals

Convertible

9,517

Coupe

7,029

Hardtop

65,176

 

 

Total Production

81,722

 

 

400 Ram Air

751

400 H.O.

13,827

400 2BBL.

2,967

400 Std. Engine

64,177

 

 

Manual

39,128

Automatic

42,594

 

 

400 Ram Air (Auto)

138

400 Ram Air (Manual)

613

 

 

 

 

 

1968 GTO Engine Codes & Production Totals

 

 

Engine C.I.D.

Carb. Type

Trans. Code

Std. Code

Compression Ratio

Horsepower

400

4-BBL

3-SPD.MAN

WT

10.75:1

350

400 H.O.

4-BBL

3-SPD.MAN

WS

10.75:1

360

400

4-BBL

4-SPD.

WT

10.75:1

350

400 H.O.

4-BBL

4-SPD.

WS

10.75:1

360

400 R.A.

4-BBL

4-SPD.MAN

XS

10.75:1

360

400

4-BBL

AUTO.

YS

10.75:1

350

400

2-BBL

AUTO.

XM

8.60:1

265

400 H.O.

4-BBL

AUTO.

YZ

10.75:1

360

400 R.A.

4-BBL

AUTO.

XP

10.75:1

360

 

Special Note:
A 428 cubic inch motor could be ordered and dealer installed in a 68 GTO, but there were no factory built 428 GTO`s. A fully documented 428 GTO is very desirable and extremely rare. If not documented this application is incorrect.

 

 

1968 GTO Production Totals

Hardtop

400 Ram Air (Manual)

757

 

400 Ram Air (Auto)

183

 

400 H.O. (Manual)

6,197

 

400 H.O. (Auto)

3,140

 

400 2BBL. (Manual)

0

 

400 2BBL. (Auto)

2,841

 

400 Std.Engine (Manual)

25,371

 

400 Std.Engine (Auto)

39,215

Total Hardtop

 

77,704

 

 

 

Convertible

400 Ram Air (Manual)

92

 

400 Ram Air (Auto)

22

 

400 H.O. (Manual)

766

 

400 H.O. (Auto)

461

 

400 2BBL. (Manual)

0

 

400 2BBL. (Auto)

432

 

400 Std.Engine (Manual)

3,116

 

400 Std.Engine (Auto)

5,091

Total Convertible

 

9,980

 

 

 

Total Production

 

87,684

 

1969 GTO Engine Codes & Production Totals

 

 

Engine C.I.D.

Carb. Type

Trans. Code

Std. Code

Compression Ratio

Horsepower

400

4-BBL

3SPD.MAN

WT

10.75:1

350

400 R.A.III

4-BBL

3SPD.MAN

WS

10.75:1

366

400

4-BBL

4SPD.MAN

WT

10.75:1

350

400 R.A.III

4-BBL

4SPD.MAN

WS

10.75:1

366

400 R.A.IV

4-BBL

4SPD.MAN

WW

10.75:1

370

400

4-BBL

AUTO.

YS

10.75:1

350

400

2-BBL

AUTO.

XX

8.60:1

265

400 R.A.III

4-BBL

AUTO.

YZ

10.75:1

366

400 R.A.IV

4-BBL

AUTO.

XP

10.75:1

370

 

 

1969 Production Totals

Hardtop

400 Ram Air IV (Manual)

549

 

400 Ram Air IV (Auto)

151

 

400 Ram Air III (Manual)

6,143

 

400 Ram Air III (Auto)

1,986

 

400 2BBL. (Manual)

0

 

400 2BBL. (Auto)

1,246

 

400 Std. Engine (Manual)

22,032

 

400 Std. Engine (Auto)

32,744

Hardtop

 

58,126

Hardtop Judge

 

6,725

Total Hardtop

 

64,851

 

 

 

Convertible

400 Ram Air IV (Manual)

45

 

400 Ram Air IV (Auto)

14

 

400 Ram Air III (Manual)

249

 

400 Ram Air III (Auto)

113

 

400 2BBL. (Manual)

0

 

400 2BBL. (Auto)

215

 

400 Std. Engine (Manual)

2,415

 

400 Std. Engine (Auto)

4,385

Convertible

 

7,328

Convertible Judge

 

108

Total Convertible

 

7,436

Total Judge

 

6,833

Total Production

 

72,287

1970 Engine Codes & Production Totals

 

Engine C.I.D.

Carb. Type

Trans. Code

Std. Code

Compression Ratio

Horsepower

400

4-BBL

3SPD.MAN

WT

10.25:1

350

400 R.A.III

4-BBL

3SPD.MAN

WS

10.50:1

366

455

4-BBL

3SPD.MAN

WA

10.00:1

360

400

4-BBL

4SPD.MAN

WT

10.25:1

350

400 R.A.III

4-BBL

4SPD.MAN

WS

10.50:1

366

400 R.A.IV

4-BBL

4SPD.MAN

WW

10.50:1

370

455

4-BBL

4SPD.MAN

WA

10.00:1

360

400

4-BBL

AUTO.

YS

10.25:1

350

400 R.A.III

4-BBL

AUTO.

YZ

10.50:1

366

400 R.A.IV

4-BBL

AUTO.

XP

10.50:1

370

455

4-BBL

AUTO.

YA

10.00:1

360

 

 

1970 Production Totals

Hardtop

400 Ram Air IV (Manual)

627

 

400 Ram Air IV (Auto)

140

 

400 Ram Air III (Manual)

3,054

 

400 Ram Air III (Auto)

1,302

 

455 4BBL. (Manual)

1,761

 

455 4BBL. (Auto)

1,986

 

400 Std.Engine (Manual)

9,348

 

400 Std.Engine (Auto)

18,148

Hardtop

 

32,737

Hardtop Judge

 

3,629

Total Hardtop

 

36,366

Convertible

400 Ram Air IV (Manual)

24

 

400 Ram Air IV (Auto)

13

 

400 Ram Air III (Manual)

174

 

400 Ram Air III (Auto)

114

 

455 4BBL. (Manual)

158

 

455 4BBL. (Auto)

241

 

400 Std.Engine (Manual)

887

 

400 Std.Engine (Auto)

2,173

Convertible

 

3,615

Convertible Judge

 

168

Total Convertible

 

3,783

 

 

 

Total Judge

 

3,797

Total Production

 

40,149

 

1971 Engine Codes & Production Totals

 

 

Engine C.I.D.

Carb. Type

Trans. Code

Std. Code

Compression Ratio

Horsepower

400

4-BBL

3SPD.MAN

WT

8.20:1

300

455 H.O.

4-BBL

3SPD.MAN

WL

8.40:1

335

400

4-BBL

4SPD.MAN

WK

8.20:1

300

455 H.O.

4-BBL

4SPD.MAN

WC

8.40:1

335

400

4-BBL

AUTO.

YS

8.20:1

300

455

4-BBL

AUTO.

YC

8.20:1

325

455 H.O.

4-BBL

AUTO.

YE

8.40:1

335

 

 

1971 Production Totals

Hardtop

455 H.O. (Manual)

476

 

455 H.O. (Auto)

412

 

455 4BBL. (Manual)

0

 

455 4BBL. (Auto)

534

 

400 Std. Engine (Manual)

2,011

 

400 Std. Engine (Auto)

6,421

Hardtop

 

9,497

Hardtop Judge

 

357

Total Hardtop

 

9,854

Convertible

455 H.O. (Manual)

21

 

455 H.O. (Auto)

27

 

455 4BBL. (Manual)

0

 

455 4BBL. (Auto)

43

 

400 Std. Engine (Manual)

79

 

400 Std. Engine (Auto)

508

Convertible

 

661

Convertible Judge

 

17

Total Convertible

 

678

 

 

 

Total Judge

 

374

Total Production

 

10,532

 

1972 Engine Codes & Production Totals

 

 

Engine C.I.D.

Carb. Type

Trans. Code

Std. Code

Compression Ratio

Horsepower

400

4-BBL

3SPD.MAN

WS

8.20:1

250

400

4-BBL

4SPD.MAN

WK1

8.20:1

250

455 H.O.

4-BBL

4SPD.MAN

WM2

8.40:1

300

400

4-BBL

AUTO.

YT

8.20:1

250

455

4-BBL

AUTO.

YK

8.20:1

250

455 H.O.

4-BBL

AUTO.

YB

8.40:1

300

400

2-BBL

AUTO.

XX

8.60:1

265

Special Notes:
1 Indicates Wide Ratio 4-Spd.
2 Indicates Close Ratio 4-Spd.

1972 Production Totals

Coupe

455 H.O. (Manual)

3

 

455 H.O. (Auto)

7

 

455 4BBL. (Manual)

0

 

455 4BBL. (Auto)

5

 

400 Std. Engine (Manual)

59

 

400 Std. Engine (Auto)

60

Total Coupe

 

134

Hardtop

455 H.O. (Manual)

310

 

455 H.O. (Auto)

325

 

455 4BBL. (Manual)

0

 

455 4BBL. (Auto)

235

 

400 Std. Engine (Manual)

1,519

 

400 Std. Engine (Auto)

3,284

Total Hardtop

 

5,673

 

 

 

Total Production

 

5,807

 

 

 

 

 

 

 

 

 

 

1973 Engine Codes (Early Production)

Engine C.I.D.

Carb. Type

Trans. Code

Std. Code

Calif. Code

Compression Ratio

Horsepower

400

4-BBL

3SPD.MAN

WS

--

8.0:1

230

400

4-BBL

4SPD.MAN

WK1

--

8.0:1

230

400

4-BBL

4SPD.MAN

WP

--

8.0:1

230

400

4-BBL

AUTO.

YS

--

8.0:1

230

400

4-BBL

AUTO.

--

ZS

8.0:1

230

400

4-BBL

AUTO.

YY1

--

8.0:1

230

400

4-BBL

AUTO.

Y31

--

8.0:1

230

400

4-BBL

AUTO.

YT2

--

8.0:1

230

455

4-BBL

AUTO.

YC

--

8.0:1

250

455

4-BBL

AUTO.

--

ZC

8.0:1

250

455

4-BBL

AUTO.

YA1

--

8.0:1

250

455

4-BBL

AUTO.

--

ZA

8.0:1

250

455

4-BBL

AUTO.

YK2

--

8.0:1

250

455

4-BBL

AUTO.

YD3

--

8.0:1

250

1973 Engine Code (Late Production) & Production Totals

Engine C.I.D.

Carb. Type

Trans. Code

Std. Code

Calif. Code

Compression Ratio

Horsepower

400

4-BBL

3SPD.MAN

YF

--

8.0:1

230

400

4-BBL

4SPD.MAN

Y6

--

8.0:1

230

400

4-BBL

4SPD.MAN

YG1

--

8.0:1

230

400

4-BBL

AUTO.

XN

--

8.0:1

230

400

4-BBL

AUTO.

XX1

--

8.0:1

230

400

4-BBL

AUTO.

XK2

--

8.0:1

230

455

4-BBL

AUTO.

XE

--

8.0:1

250

455

4-BBL

AUTO.

XL1

--

8.0:1

250

455

4-BBL

AUTO.

X72

--

8.0:1

250

455

4-BBL

AUTO.

XM3

--

8.0:1

250

Special Notes:
1 Cars Equipped With Unitized Ignition
2 High Country Use
3 High Country Use Equipped With Unitized Ignition

1973 Production Totals

Coupe

455 4BBL. (Manual)

0

Coupe

455 4BBL. (Auto)

25

Coupe

400 4BBL. (Manual)

187

Coupe

400 4BBL. (Auto)

282

Total Coupe

 

494

Sport Coupe

455 4BBL. (Manual)

0

Sport Coupe

455 4BBL. (Auto)

519

Sport Coupe

400 4BBL. (Manual)

926

Sport Coupe

400 4BBL. (Auto)

2,867

Total Sport Coupe

 

4,312

Total Production

 

4,806

 

1974 Engine Codes & Production Totals

 

 

Engine C.I.D.

Carb. Type

Trans. Code

Std. Code

Calif. Code

Compression Ratio

Horsepower

350

4-BBL

MAN.

WP

--

7.62:1

200

350

4-BBL

AUTO.

YP

--

7.62:1

200

350

4-BBL

AUTO. 1

--

ZP

7.62:1

200

350

4-BBL

AUTO.

YS

--

7.62:1

200

Special Notes:
All 1974 GTO's were equipped with a 350 cubic inch V8, rated at 200 Horsepower at 4400 rpm. All had a 7.62:1 compression ratio. All were 4BBL equipped cars.

1 This denotes California usage only. Manual transmissions were not available for use in California in 1974. The 1974 GTO's that were sold in California were equipped with M38 transmissions (hydra-matic) and a 3:08:1 rear axle.

 

1974 Production Totals

Hatchback

350 4BBL. (Manual)

687

 

350 4BBL. (Auto)

1,036

Total Hatchback

 

1,723

Coupe

350 4BBL. (Manual)

2,487

 

350 4BBL. (Auto)

2,848

Total Coupe

 

5,335

 

 

 

Total Production

 

7,058