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The 1991 Chevrolet Corvette

        Turqoise Corvette Coupe

1991 Corvettes got the rear end look from the 1990 ZR-1 including the rectangular tail lights. A new front end as well including wrap around parking lights, new side panel vents and body color side moldings. The base wheels were changed to a new saw-blade design. The new RPO Z07 included the Z51 suspension components and the FX3 adjustable ride options, this provided an in-cockpit adjustable ride from stiff to very stiff. A power wire was added for accessories like cell-phones and a float based oil pressure monitor. A new power-delay feature allowed the windows and radio to work for a time after the ignition key was removed.

1991 Corvette Base Engine

1991 Base Engine

1991 Corvette ZR-1 Engine

1991 ZR-1 Engine

Production Options and Build Statistics

Total 1991 Corvettes Built - 20,639
Total 1991 Coupes - 14,967
Total 1991 Convertibles - 5,672
Total 1991 ZR1 (includes ZR-1) - 2,044

Coupe Serial Numbers: 1G1YY238xM5100001 to 1G1YY238xM5118595
Convertible Serial Numbers: 1G1YY338xM5100001 to 1G1YY338xM5118595
ZR-1 Serial Numbers: 1G1YZ23JxM5800001 to 1G1YZ23JxM5802044

The "Vehicle Identification Number" (also VIN or serial number) is stamped on a plate on the inner vertical surface of the left windshield pillar visible through the windshield.

Position Character Description
1 1 US built
2 G General Motors product
3 1 Chevrolet Motor Division vehicle
4&5 YY Basic Corvette
YZ Corvette ZR-1
6 2 or 3 Body style number
2 = Two door hatchback style 07, 08, 77, or 87
3 = Two door convertible style 67
7 1 or 2 1=Manual seat belts
3=Manual belts with driver-inflatable restraint system
4=Automatic belts
8 8 L98 5.7-liter Tuned-Port-Injection Chevrolet or GM of Canada V8
J LT5 - 5.7-liter TPI V-8
9 ? A check digit that calculates the characters in the serial number and gives it a single digit code and can be used to verify that the serial number is legitimate
10 M The model year M=1991
11 5 Bowling Green, Kentucky
12-17 100001 and up Production Sequence for Coupes and Convertibles
800001 and up Production Sequence for ZR-1s

Engine Serial Number

1991 Corvette engines have the last six digits of the VIN stamped on the block after the engine number. The date code the engine was manufactured was also cast into the block. The engine serial number includes a production sequence number starting with 0001001 and one of the suffixes below.

Code Engine Horsepower Compression Transmission Fuel Supply Extra Features
ZTA L98 350-cid 245/250-hp V-8 10.0:1 Automatic Tuned Port Injection (TPI) ;
ZTB L98 350-cid 245/250-hp V-8 10.0:1 Manual Tuned Port Injection (TPI) Engine Oil Cooler
ZTC L98 350-cid 245/250-hp V-8 10.0:1 Automatic Tuned Port Injection (TPI) Engine Oil Cooler
ZTK LT5 350-cid 375-hp V-8 11.0:1 Manual Tuned Port Injection (TPI) ;

250 horsepower engines were in coupes with the 3.07:1 rear end only. 245 horsepower engines were in all other coupes and all convertibles.

Production Options

RPO Description Price Production
1YY07 Base Coupe $32,455 14,967
1YY67 Base Convertible $38,770 5,672
AC1 Power Passenger Seat $290.00 17,267
AC3 Power Driver Seat $290 19,937
AQ9 Leather Sport Seats $1,050 10,650
AR9 Base Leather Seats $425 N/A
B2K Callaway Twin Turbo $33,000 62
CC2 Auxiliary Hardtop (Convert.) $1,995 1,230
C2L Dual Removable Roof Panels $915 5,031
24S Removable Roof Panel, blue tint $615 6,991
64S Removable Roof Panel, bronze tint $615 3,036
C68 Electronic Air Conditioning $180 19,233
FX3 Selective Ride and Handling System $1,695 6,894
G92 Performance Axle Ratio $22 N/A
KC4 Engine Oil Cooler $110 7,525
MN6 6-spd, Manual Transmission $0.00 5,875
NN5 California Emission Requirements $100 3,050
UJ6 Low Tire Pressure Warning System $325 5,175
UU8 Delco Bose Stereo System $823 3,786
U1F Delco Bose CD Stereo System $1,219 15,345
V56 Luggage Rack (convertible) $140 886
Z07 Adjustable Suspension Pkg. (coupe) $2,155 733
ZR1 Special Performance Handling Pkg. (coupe) $31,683 2,044
AJ3 Front Seat Inflatable Restraint System N/A N/A
CC3 Removable Plastic Roof Panel N/A N/A
CF7 Removable Roof Panel (Solid Body Color) N/A N/A
C60 Manual Air Conditioning Controls N/A N/A
DC7 Electronic LH & RH Outside Mirrors N/A N/A
DC8 Electronic LH & RH Outside Mirrors N/A N/A
DL8 LH/RH Heated Sport Mirrors N/A N/A
D3X Speedometer Driven Gear (25513049) N/A N/A
D4L Speedometer Driven Gear (25513050) N/A N/A
D7B Speedometer Driven Gear (25513043) N/A N/A
D7C Speedometer Driven Gear (25513045) N/A N/A
D8E Vehicle Speed Sensor (10456021) N/A N/A
D8F Vehicle Speed Sensor (10456022) N/A N/A
D8H Vehicle Speed Sensor (10456039) N/A N/A
FE1 Soft Ride Suspension N/A N/A
FE7 Heavy Duty Suspension N/A N/A
GM1 2.59 Rear Axle Ratio N/A N/A
GM3 3.45 Rear Axle Ratio (8.5 in. Ring Gear) N/A N/A
GU2 2.73 Rear Axle Ratio N/A N/A
G44 3.07 Rear Axle Ratio N/A N/A
JL9 Antilock Front and Rear Disc Brakes N/A N/A
J55 Heavy Duty Brakes N/A N/A
K05 Engine Block Heater (Canada Export only) N/A N/A
K09 120-Amp Generator N/A N/A
K68 105-Amp Generator N/A N/A
L98 8-Cyl., V8, 5.7L (Vin 8) Engine N/A N/A
LT5 8-Cyl., V8, 5.7L (Vin J) Engine N/A N/A
MD8 4-Spd. 4L60 Automatic Transmission N/A N/A
na5 Federal Emission systems N/A N/A
NK4 Sport Leather Steering Wheel N/A N/A
QA1 Wheel, 17 x 9.5, Aluminum N/A N/A
QA2 Wheels, 17 x 9.5 (Front), 17 x 11 (Rear), Aluminum N/A N/A
T61 Daytime Running Lights N/A N/A
UM6 Bose Stereo w/ CD & Cassette, Seek/Scan, Clock, ETR Radio N/A N/A
UXO Dual Floor Sill & Extended Range Speaker System N/A N/A
U19 Miles & Kilometers Dash Cluster N/A N/A
U52 Electronic Instrument Cluster N/A N/A
U75 Power Antenna N/A N/A
XAU Front Tire, P275/40ZR17 N/A N/A
YAU Rear Tire, P275/40ZR17 N/A N/A
YBE Rear Tire, P315/35ZR17 N/A N/A

Color Options for 1991

Interior options for exterior colors are suggested by Chevrolet. Other combinations could be ordered.

RPO Exterior Interior Soft Top Production
10 White B-BK-G-R-S BG-BK-W 4,305
25 Steel Blue Metallic B-BK B-BK-W 835
35 Yellow BK-G-S BG-BK-W 650
41 Black B-BK-G-R-S BG-BK-W 3,909
42 Turquoise Metallic BK-S B-BK 1,621
75 Dark Red Metallic BK-S BG-BK-W 1,311
80 Quasar Blue Metallic BK-S BG-BK 1,038
81 Bright Red BK-G-R-S BG-BK-S 5,318
91 Polo Green Metallic BK-S BG-BK 1,230
96 Charcoal Metallic BK-G-S BK-W 417
Color Codes: B=Blue, BG=Beige, BK=Black, C=Cloth, G=Gray, L=Leather, R=Red, S=Saddle, W=White

Interior Colors

RPO Color Production
19C Black Cloth 379
60C Saddle Cloth 105
193 Black Leather 10,376
223 Blue Leather 809
603 Saddle Leather 3,084
733 Red Leather 4,481
903 Gray Leather 1,889

Convertible Top Color Codes

RPO Color Production
N/A Blue (Only available on Steel Blue Metallic and Turquoise Metallic paint) 162
N/A Beige 950
N/A Black 3,158
N/A White 1,402

1991 Corvette Specifications

Mechanical Dimensions

Feature Coupe Convertible ZR-1
Wheelbase 96.2 inches (2.443 m) 96.2 inches (2.443 m) 96.2 inches (2.443 m)
Overall length 176.5 inches (4.483 m) 176.5 inches (4.483 m) 177.4 inches (4.506 m)
Overall width 71.0 inches (1.803 m) 71.0 inches (1.803 m) 74.0 inches (1.880 m)
Overall height 46.7 inches (1.186 m) ; 46.7 inches (1.186 m)
Front Tread 59.6 inches (1.514 m) 59.6 inches (1.514 m) 59.6 inches (1.514 m)
Rear Tread 60.4 inches (1.534 m) 60.4 inches (1.534 m) 61.9 inches (1.572 m)
Front Tires P275/40ZR-17 Goodyear Eagle GT P275/40ZR-17 Goodyear Eagle GT P275/40ZR-17 Goodyear Eagle GT
Rear Tires P275/40ZR-17 Goodyear Eagle GT P275/40ZR-17 Goodyear Eagle GT P315/35ZR-17 Goodyear Eagle GT
Steering rack and pinion (power assisted)
Front Suspension Single fiberglass composite monoleaf transverse spring with unequal-length aluminum control arms and stabilizer bar
Rear Suspension Fully independent five-link system with transverse fiberglass single-leaf springs, aluminum upper/lower trailing links and strut-rod tie-rod assembly
Brakes Four-wheel power disc
Body Construction Unibody with partial front frame
Fuel Tank 20 US Gal (16.7 Imp Gal) (76 liters)

Engine Specifications

Feature Base Engine RPO L98 ZR-1 Engine RPO LT5
Type V-8, 90-degree Overhead valve V-8, 90-degree Overhead valve with 4 valves per cylinder and 4 overhead camshafts
Block Cast Iron with Aluminum Cylinder Heads Aluminum;
Displacement 350 cid (5.7 liters) 350 cid (5.7 liters)
Bore & Stroke 4.00" x 3.48" 4.00" x 3.48"
Compression Ratio 10.0:1 11.0:1
Brake Horsepower 245 @ 4000 (250-hp for hatchbacks using 3.07:1 rear axle due to use of low-restriction mufflers with this option combination only) 375 @ 5800 rpm
Torque 340 lb-ft @ 3200 370 lb-ft @ 5600
Main Bearing Five Five
Valve Lifters Hydraulic Hydraulic
Fuel Supply Tuned-port induction (TPI) system Tuned-port induction (TPI) system
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