• Not a year of great change after the launch of the ZR-1 the previous year.
• Standard Corvettes were restyled at the rear to more closely resemble the ZR-1 with a convex rear fascia and two rectangular tail lamps on either side of the car.
• A new front end with wrap-around parking lamps was used on both models, along with new side-panel louvers and wider body-color body side moldings.
• Although more alike the standard Corvette in a visual sense, the ZR-1 again had difterent doors and a wider rear to accommodate its 11-inch wide rear wheels.
• Also the high-mounted stop lamp went on the roof of the ZR-1, instead of on the rear fascia, as on the YY Corvette.
• All models were again equipped with ABS Il-S anti-lock braking and driver's side airbag as well as an anti-theft system.
• The ZR-1 was again powered by the 32-valve DOHC 5.7-liter V-8 matched with a six-speed transaxle.
• Corvette models used the 5.7-liter TPI V-8 fitted with the four-speed overdrive auto­matic or optional six-speed manual transmission.
• Corvette colors were
  • White
  • Steel Blue Metallic
  • Yellow
  • Black
  • Turquoise Metallic
  • Dark Red Metallic
  • Quasar Blue Metallic
  • Bright Red
  • Polo Green Metallic
  • Charcoal Metallic
• Interiors came in Blue; Black; Gray; Red; Saddle; and White.
• Standard features included a removable body-color roof panel for hatchbacks or a convertible top.
• Black, Saddle, Red, White, and (late in the year) Blue top colors were available, but the choices were determined by body paint color.
• Cloth upholstery was also standard.

I.D. NUMBERS

• The serial number [Vehicle Identification Number -- VIN] was stamped on a plate on the inner vertical surface of the left windshield pillar visible through the windshield.
• The coupe serial numbers ranged from 1G1YY238*M5100001 to 1G1YY238*M5118595
• The convertible serial numbers ranged from 1G1YY338*M5100001 to 1G1YY338*M5118595
• The ZR1 serial numbers ranged from 1G1YZ23J*M5800001 to 1G1YZ23J*M5802044

  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 where 1991
  11	5	Bowling Green, KY
  12-17	100001 and up	production sequence for coupes and convertibles
  	800001 and up	production sequence for ZR-1s

• Corvette engines have the last six digits of the VIN stamped on the block just ahead of the cylinder head on the right-hand side combined with a three-letter engine code suffix
• Also cast into the top rear of the block is a four-symbol code indicating when the engine was built
  • The first letter of the date code shows the month the block was cast
  • The one or two numbers shows the month
  • The last digit shows the year
• Engine suffixes:

  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
  ZTB	L98 350-cid	245/250-hp V-8	10.0:1	manual	tuned port injection	Engine oil cooler
  ZTC	L98 350-cid	245/250-hp V-8	10.0:1	automatic	tuned port injection	Engine oil cooler
  ZTK	LT5 350-cid	375-hp V-8	11.0:1	manual	tuned port injection

• The 1991 Corvette exterior colors were:
  • 10 = White
  • 25 = Steel Blue Metallic
  • 35 = Yellow
  • 41 = Black
  • 42 = Turquoise Metallic
  • 75 = Dark Red Metallic
  • 80 = Quasar Blue Metallic
  • 81 = Bright Red
  • 91 = Polo Green Metallic
  • 96 = Charcoal Metallic
• Upholstery Codes

  Color	Cloth Upholstery	Leather Upholstery
  Black	19C	193
  Saddle	60C	603
  Blue		223
  Red		733
  Gray		903

Model	Model No.	Body/Style No.	Body Type	Factory Price	Shipping Weight	Production Total
Coupe	1YY	Y07	2-dr. Hatch Coupe - 2 passenger	$32,455	3223	14,967
Convertible	1YY	Y67	2-dr. Convertible - 2 passenger	$38,770	3263	5,672
ZR-1	1YZ	Z07	2-dr. Hatch Coupe - 2 passenger	$64,138	3465	2,044

TRANSMISSION

• Automatic Transmission
  • Four-speed Turbo Hydra-Matic (TMH 700-R4)
  • floor-mounted gear shifter
  • gear ratios
    • 1st = 3.06:1
    • 2nd = 1.63:1
    • 3rd = 1.00:1
    • 4th = 0.70:1
    • Rev = 2.29:1
  • Final drive ratio: 2.59:1 or 3.07:1
• Four-speed Manual Transmission with overdrive
  • floor-mounted gear shifter
  • gear ratios
    • 1st = 2.88:1
    • 2nd = 1.91:1
    • 3rd = 1.33:1
    • 4th = 1.00:1
    • overdrive = 0.67:1
    • Rev = 2.78:1
  • Final drive ratio: 3.07:1
• Six-speed Manual with overdrive
  • Final drive ratio: 3.07:1

• RPO AC1 Power passenger seat $290
• RPO AC3 Power driver seat $290
• RPO A09 Leather sports seats $1050
• RPO AR9 Base leather seats $425
• RPO B2K Callaway Twin Turbo installed by Callaway Engineering $33,000
• RPO CC2 Auxiliary hardtop for convertible $1995
• RPO C2L Dual removable roof panels for coupe $915
• RPO 24S Removable roof panels with blue tint for coupe $615
• RPO 64S Removable roof panels with bronze tint for coupe $615
• RPO C68 Electronic air conditioning control $180
• RPO FX3 Electronic Selective Ride & Handling system $1,695
• RPO G92 Performance axle ratio 3.07:1 $22
• RPO KC4 Engine oil cooler $110
• RPO MN6 Six-speed man­ual transmission -- no-cost option
• RPO NNS California emissions requirements $100
• RPO UJ6 Low tire pressure warning indicator $325
• RPO UU8 Delco-Bose stereo system $823
• RPO UlF Delco-Bose stereo system with compact disc chang­er $1,219
• RPO V56 Luggage rack for convertible $140
• RPO Z07 Adjustable handling package $2,500 (733 were built)
• RPO ZR1 Special performance package for coupe $31,683

• Model-year pro­duction: 20,639
• Calendar-year sales: 17,472.
• The $33,000 Callaway Twin-Turbo engine package could again be ordered through specific Chevrolet dealers as RPO B2K.
• Cars that received this package were sent from Bowling Green, Kentucky to the Callaway factory in Old Lyme, Connecticut, to receive engine modifications and other upgrades.
• Callaway built its 500th conversion on September 26, 1991.
• Twin Turbos made after that were "Callway 500" editions with special features and a $600 higher price tag.
• For 1991 Callaway Twin-Turbo Corvettes a different engine-coding system was used.
• Callaway engines were stamped with the first two symbols indicating model year, followed by three symbols indicating order in the Callaway production sequence, followed by four symbols matching the last four digits of the Chevrolet VIN.
• Corvette buyers who wanted to participate in World Challenge Series racing had to buy a stock Corvette from Chevrolet and handle race-prep work themselves.

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