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VIN information and other identifying numbers for the 1970 Corvette including engine block, head id, casting numbers and more.

VIN Tag Information
194370S400001 - 194370S417316 (coupe)
194670S400001 - 194670S417316 (convertible)
Digit Definition
1st Division:  1 = Chevrolet
2nd / 3rd Series:  94 = Corvette
4th/5th Body Style:  37 = 2-door coupe, 67 = 2-door convertible
6th Model Year:  0 = 1970
7th Assembly Plant:  S = St. Louis, MO.
Last 6 digits Production Number starting with 400001 - 417316

Engine Suffix ID Numbers>
CGW: 454ci, 390hp (automatic transmission)
CRJ: 454ci, 390hp (automatic transmission, transistor ignition)
CRI: 454ci, 390hp (manual transmission, transistor ignition)
CTD: 350ci, 300hp (manual transmission)
CTG: 350ci, 300hp (automatic transmission)
CTH: 350ci, 350hp (manual transmission)
CTJ: 350ci, 350hp (air conditioning, manual transmission)
CTK: 350ci, 370hp (manual transmission, transistor ignition)
CTL: 350ci, 300hp (manual transmission)
CTM: 350ci, 300hp (automatic transmission)
CTN: 350ci, 350hp (manual transmission)
CTO: 350ci, 350hp (air conditioning, manual transmission)
CTP: 350ci, 350hp (manual transmission, transistor ignition)
CTQ: 350ci, 350hp (air conditioning, manual transmission, transistor ignition)
CTR: 350ci, 370hp (manual transmission, transistor ignition)
CTU: 350ci, 370hp (manual transmission, transistor ignition)
CTV: 350ci, 370hp (ZR1) (manual transmission)
CZU: 454ci, 390hp (manual transmission)
Note: Some early 1970 engines may have 1969 engine codes.

Block ID Numbers>
3970010: 350ci, 300hp, 350hp, 370hp
3963512: 454ci, 390hp

Head ID Numbers>
3927186: 350ci, 300hp, 350hp, 370hp
3927187: 350ci, 350hp
3964290: 454ci, 390hp
3973414: 350ci, 370hp

Cylinder Head Casting Number:
The cylinder head casting number is usually found on top of the cylinder head in between two valves and the rocker arm studs.

Cylinder Head Casting Date:
The cylinder head casting date is usually found adjacent to the cylinder head casting number. The casting date code is an alphanumeric sequenced number. The first digit is usually a letter which specifies the month that the block was cast. Some casting dates have been found with all digits being numbers, the first of which corresponds to the month.


Cylinder Head Casting Number Month Codes (1st Digit)
A - January E - May I - September
B - February F - June J - October
C - March G - July K - November
D - April H - August L - December

Two main plants were casting Chevrolet engine parts during 1970: Flint, Michigan and Tonawanda, New York.

Example:  Flint Cylinder Head Casting Number - D 19 9

  • D:  Month = April
  • 19:  Casting Day = 19th
  • 9:  Casting Year = 1959

Example:  Tonawanda Cylinder Head Casting Number - D 19 59

  • D:  Month = April
  • 19:  Casting Day = 19th
  • 59:  Casting Year = 1959

Carburetor ID Numbers>
Rochester Q-jet #7040202: 350ci, 300hp (automatic transmission, first design)
Rochester Q-jet #7040203: 350ci, 300hp (manual transmission, first design)
Rochester Q-jet #7040204: 454ci, 390hp (automatic transmission)
Rochester Q-jet #7040205: 454ci, 390hp (manual transmission)
Rochester Q-jet #7040207: 350ci, 350hp (manual transmission)
Rochester Q-jet #7040212: 350ci, 300hp (automatic transmission, second design)
Rochester Q-jet #7040213: 350ci, 300hp (manual transmission, second design)
Rochester Q-jet #7040502: 350ci, 300hp (automatic transmission, evaporative emission controls)
Rochester Q-jet #7040503: 350ci, 300hp (automatic transmission, evaporative emission controls, first design)
Rochester Q-jet #7040504: 454ci, 390hp (automatic transmission, evaporative emission controls)
Rochester Q-jet #7040505: 454ci, 390hp (manual transmission, evaporative emission controls)
Rochester Q-jet #7040507: 350ci, 350hp (manual transmission, evaporative emission controls)
Rochester Q-jet #7040513: 350ci, 300hp (manual transmission, evaporative emission controls, second design)
Holley R4489A #3972123: 350ci, 370hp (manual transmission, evaporative emission controls)
Holley R4555A #3972121: 350ci, 370hp (manual transmission)

Distributor ID Numbers>
1111464: 454ci, 390hp
1111490: 350ci, 300hp (early production)
1111491: 350ci, 370hp (transistor ignition)
1111493: 350ci, 350hp (early production)
1112020: 350ci, 300hp (transistor ignition)
1112021: 350ci, 350hp

Alternator ID Numbers>
1100884: 350ci, 370hp (or all air conditioning)
1100900: 350ci - 350h, 454ci - 390hp
1100901: 350ci, 300hp