28.566 Corvettes were built in 1968. 9.936 Coupe and 18.630 Convertibles.
The Vehicle Identification Numbers, VIN were 194378S400001 through 194378S428566
For convertibles, fourth digit is a 6

Type Basic Basic Basic Basic Basic Basic
Cubic Inch 327 327 427  427 427 427 L88*
HP @ RPM 300 @ 5000 350 @ 5800 390 @ 5400 400 @ 5400 435 @ 5800 430 @ 5200 
Torque  RPM 360 @ 3400 360 @ 3600 460 @ 3600 460 @ 3600 460 @ 4000 450 @ 4400 
Comp. Ratio 10.0:1 11.0:1 10.25:1 10.25:1 11.0:1 12.0:1
Bore / Stroke 4.00 x 3.25 4.00 x 3.25 4.25 x 3.76 4.25 x 3.76 4.25 x 3.76 4.25 x 3.76
Carburator 4bbl 4bbl  4bbl 3x2bbl  3x2bbl 4bbl 
In Manifold N/A N/A N/A N/A N/A N/A
Valve Lifters N/A N/A N/A N/A N/A N/A
Exhaust N/A N/A N/A N/A N/A N/A
Oil Capacity2 4 Qt 4 Qt 5 QT 5 QT 5 QT 5 QT
Spark Plugs Type 44 Type 44 Type 43N Type 43N Type 43N1 Type C42N1
* Limited production engine
1 Models with aluminum heads use A.C R43XL
2. Add 1 Qt if you put a new oil filter.

3917215 327 CID - 300 HP & 350 HP
3916321 427 CID - 390 HP - 400 HP - 430 HP  & 435 HP
3953439 427 CID - 430 HP  & 435 HP

3917291 327 CID - 300 HP & 350 HP
3917292 327 CID - 350 HP
3917215 427 CID - 390 HP & 400 HP
3919840 427 CID - 435 HP ( Iron Head )
3919842 427 CID - 430 HP & 435 HP ( Aluminum Heads )

327 Cubic Inch Engine CODE
Manual transmission HE
Power steering and A/C HP
Special high performance HT
Turbo Hydra-Matic HO
427 Cubic Inch Engine CODE
High performance IT
High Performance IL
Triple Carburetion + High Performance + Turbo Hydra-Matic  IO
Triple Carburetion + High Performance IM
Triple Carburetion + Special High Performance IR
Turbo Hydra-Matic IQ
Triple Carburetion + Special High Performance + Aluminum heads  IU

Ratio and Type CODE
3.36 AK
3.08 Positraction AL
3.36 Positraction AM
3.55 Positraction AN
3.70 Positraction AO
4.11 Positraction AP
3.70 AS
3.08 Heavy Duty Positraction AT
3.36 Heavy Duty Positraction AU
3.08 Positraction AV
3.08 Heavy Duty Positraction AW

Color CODE
Tuxedo Black 900
Polar White 972
Rally Red 974
LeMans Blue 976
International Blue 978
British Green 983
Safari Yellow 984
Silverstone Silver 986
Cordovan Maroon 988
Corvette Bronze 992

Tommy Ledberg