1970 Corvette Registry
Major Component Codes

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Note:  Some of the number codes & usage guidelines here have been updated based on the NCRS Technical Judging Guidelines.  The former chart was based exclusively on magazine publications.  Update: 29 June 2002.

Engine

Wide Ratio 4 Spd (M20)

Close Ratio 4 Spd (M21)

Close Ratio (HD) 4 Spd (M22)

Auto

Base (350 / 300)

Std - 3.36

Not Available

Not Available

Std - 3.08

 

Optional - 3.08

 

 

Optional - 3.36

L46 (350 / 350)

Std - 3.36

Std - 3.70

Not Available

Not Available

 

Optional - 3.55

Optional - 4.11

 

 

LT1 (350 / 370)

Std - 3.55

Std - 3.70

Available with ZR1 Option

Not Available

 

Optional - 3.36, 3.70

Optional - 3.55, 4.11

3.70, 4.11, 4.56

 

LS5 (454 / 390)

Std - 3.08

Std - 3.36

Not Available

Std - 3.08

 

Optional - 3.36

Optional - 3.08, 3.55, 3.70

 

Optional - 2.73

1970 Corvette Engine Suffixes  

Engine

Suffix

350/300 (Auto)

CTG

350/300 (4 Spd)

CTD

350/350 (4 Spd)

CTH

350/350 (TI)

CTP

350/350 (AC)

CTJ

350/350 (AC & TI)

CTQ

350/370 (4 Spd & TI)

CTK, CTU

350/370 (ZR1)

CTV

454/390 (4 Spd)

CZU

454/390 (Auto)

CGW

454/390 (4 Spd & TI)

CRI

454/390 (Auto & TI)

CRJ

Axle Ratio

Build Sheet Code*

Axle Code

2.73

GU2

CAY

3.08

GV2, GU4

CAL, CAT, CAV, CAW

3.36

GV4

CAK, CAM, CAU, CLR

3.55

GV7

CAN, CAZ

3.70

GS4

CAO, CAS, CFA

4.11

H22

CAP, CFB

4.56

HF7

CFC

* These Axle Ratios are unconfirmed and based on a limited number of build sheets and GM Published  Corvette Chassis & Body Parts 
If you can supply any additional documentation please contact Juliet.

1970 Trim Tag Color Numbers

Exterior

Interior

976 Mulsanne Blue
979 Bridgehampton Blue
982 Donnybrooke Green
992 Laguna Gray
975 Marlboro Maroon
993 Corvette Bronze
974 Monza Red
986 Cortez Silver
972 Classic White
984 Daytona Yellow
SPC Special, Delivered in Factory Primer

400 - Black Vinyl 
403 - Black Leather
407 - Red Vinyl 
411 - Bright Blue Vinyl
414 - Brown Vinyl
418 - Saddle Vinyl
422 - Green Vinyl 
424 - Saddle Leather

 

 

1970 Corvette Date Codes

 

 

Date Codes: Radiator, Surge Tank, Water Pump & Voltage Regulator

A = January

C = March

E = May

G = July

I = September

K = November

B = February

D = April

F = June

H = August

J = October

L = December

 

 

70 or 0 = 1970

69 or 9 = 1969

 

 

Radiator:

Stamped top left

 

Surge Tank:

Stamped below "Harrison" logo

Example: 70F = June 70

Voltage Reg:

Stamped left side of bracket

Example: "0A" = January 1970

Distributor & Alternator Date Codes

 

Glass Date Codes

 

 

A = January

G = July

9 = 1969

N = January

U = July

V = 1969 Prod

B = February

H = August

0 = 1970

X = February

T = August

T = 1970 Prod

C = March

J = September

 

L = March

A = September

 

D = April

K = October

 

G = April

Y = October

 

E = May

L = November

 

J = May

C = November

 

F = June

M = December

 

I = June

V = December

 

Examples:

"LT" = Mar 70

"CV" = Nov 69

Alternator:

Example - "9J18" = 1969 September 18

Stamped:

- "LOF" (Libby-Owen-Ford)

Distributor:

Marked the same as the alternator

 

- "AS1" on the windshield

 

 

 

 

-  "AS2" on all other glass

 

 

 

 

(AS = American Standards)

Examples of "Number's Matching".  ECS=Evaporative Emissions Control System (NA9 California Emissions)

ITEM

350/300 MT

350/300 Auto

350/350

350/370

350/370 - ZR1

454/390 MT

454/390 Auto

Engine Block

3970010

3970010

3970010

3970010

3970010

3963512

3963512

Engine Suffix

CTD

CTG

CTH

-

-

CZU

CGW

Engine Suffix with AC

-

-

CTJ

-

-

-

-

Engine Suffix with TI

-

-

CTP

CTK, CTU

CTV

CRI

CRJ

Engine Suffix with TI & AC

-

-

CTQ

-

-

-

-

Cylinder Head

3927186

3927186

3927186

3927186

3927186

3964290

3964290

Exhaust Manifold Driver Side

3846559

3846559

3846559

3872765

3872765

3969869

3880827

Exhaust Manifold Passenger (Early)

Exhaust Manifold Passenger(Late)

3932465

3989036

3932465

3989036

3932465

3989036

3932461

-

3932461

-

3880828

-

3880828

-

Intake Manifold

3965577

3965577

3965577

3972110 (Alum)

3972110 (Alum)

3955287

3955287

Alternator - 42 Amp

1100901

1100901

1100900

-

-

1100900

-

Alternator - 61 Amp

-

-

-

1100884

1100884

-

-

Alternator - 61 Amp & AC

1100884

1100884

1100884

-

-

1100884

-

Distributors

1112020

1112020

1112021

1111491

1111491

1111464

1111464

Bellhousing

3899621

3899621

3899621

3899621

3899621

3899621

3899621

Coil

1115238/238 BR

1115238/238 BR

1115238/238 BR

1115207

1115207

1115238

1115238

Voltage Regulators

1119515

1119515

1119515

1119515

1119515

1119515

1119515

Carburetors (Early)

7040203

7040202

7040207

3972121 (Holley)

-

7040205

7040204

Carburetors (Late)

7040213

7040212

-

-

-

-

-

Carburetors (ECS, Early)

7040503

7040502

7040507

3972123 (Holley)

-

7040505

7040504

Carburetors (ECS, Late)

7040513

-

-

-

-

-

-

Fuel Pump

40769

40769

40769

40709

40709

40770

40770

Radiator (no AC)

Radiator (w/ AC)

Aluminum

Copper

Copper

Copper

Copper

Copper

Copper

-

Aluminum

-

Copper

-

Copper

-

Surge Tank

Surge Tank (w/ AC)

Aluminum

None

None

None

None

None

None

-

Aluminum

-

Aluminum

Brass

Aluminum

Brass

AC = Air Conditioning

TI = Transistor Ignition