Cadillac Allante History 1991

Cadillac Allante Models & History 1991

The Allante was once again available as a convertible or as a convertible hardtop that included both a convertible top and a removable all-aluminum hardtop.

The engine (cast iron cylinders in aluminum) was the same 4.5 liter V8 and F-7 four-speed automatic transaxle that was used in 1990. However, the engine had a new air intake resonator for quieter performance. The resonator remove a little bit of the roar when driving up a hill, but the exhaust note was the same as in 1990. Engine power was improved through the use of straighter intake ports and larger valves (45mm intake and 38mm exhaust). The exhaust was evacuated through thin-wall, cast iron manifolds that were shaped for minimum flow resistance. Also, to help reduce oil aeration, a new gear-rotor-type oil pump was added to the engine.


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Cadillac Allante 1991

Final drive ratio was 3.21:1. The Allante’s chassis was also upgraded with the second-generation speed-dependent damping system added as standard equipment. With this system, damping-select time was reduced for faster response to road inputs and vehicle speed changes. It also offered enhanced lift and dive control as well as improved diagnostics. Allante continued to offer the Bosch III antilock braking system and traction control as standard equipment. The traction control system was refined for 1991 with the addition of rubber isolated plungers that reduced noise when the system was engaged. Allante’s variable-assist rack-and-pinion power steering system was also improved with a revised pump and adapter that resulted in quieter operation and enhanced reliability.


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Cadillac Allante 1991

The convertible featured an improved, Phase II ergonomically-designed, power-fastening, folding soft top.

Inside, the Allante’s previous light charcoal interior carpeting and floor mats were replaced with dark charcoal counterparts.

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Cadillac Allante 1991


Model Series Body/Style Body Type Factory Price Shipping Weight Production Total
Allante VR3 R67 2-dr. Conv. HT $60,800 3537 lb 2500
Allante VS3 S67 2-dr. Conv. $55,250 3480 lb


The 1991 Cadillac had a 17-symbol vehicle identification number (VIN) stamped on a metal tag attached to the upper left surface of the cowl visible through the windshield.
The first digit “1” represented the manufacturing country (United States)
The second “G” represented General Motors
The third “6” represented Cadillac
The fourth and fifth “VR” represented Allante convertible hardtop
The fourth and fifth “VS” represented Allante convertible
The sixth “3” represented the body style: convertible
The seventh “1” represented active (manual) belts
The seventh “3” represented active (manual) belts with driver’s side airbag
The seventh “4” represented passive (automatic) belts
The eighth “8” represented the LQ6 4.5L V-8
The ninth is a check digit
The tenth “M” is the model year for 1991
The eleventh is the assembly plant
The remaining six digits identify the production sequence number


Type 90-degree, overhead valve, V-8, aluminum block and cast iron cylinder liners, cast iron cylinder heads
Displacement 273 cu. in. (4.5 liters)
Bore & Stroke 3.62 in. x 3.31 in.
Compression ratio 9.0:1
Brake horsepower 200 @ 4400 rpm
Torque 270 lb.-ft. @ 3200 rpm
Main bearings Five
Valve lifters Roller hydraulic
Fuel supply Tuned port fuel injection


Wheelbase 99.4 in 2.525 m
Overall length 178.7 in 4.539m
Height 51.2 in 1.3m
Width 73.5 in 1.867m
Front tread 60.3 in 1.532m
Rear tread 60.4 in 1.534m
Standard tire Goodyear Eagle VL P225/55VR16


Transmission THM-F7 automatic four-speed transaxle (includes viscous converter clutch)
Steering Power-assisted rack and pinion
Steering Ratio 15.6:1
Front suspension Independent MacPherson strut with coil springs, strut-type shock absorbers, integral-in strut and electronic variable, and stabilizer bar
Rear suspension Fully independent transverse monoleaf with integral-instrut electronic variable shock absorbers, no rear stabilizer
Brakes Power assisted front disc and rear disc with Bosch II ABS
Body construction integral body-frame
Fuel tank 22 gal.
Curb Weight 3537 lb


Standard Seating 2
Headroom – front 37.2 in.
Legroom – front 43.2 in.
Hip Room – front 54.4 in.
Shoulder Room – front 57.7 in.
Turning Diameter (left) 40 ft.
Turning Diameter (right) 40 ft.
Fuel Economy (city / hwy) 15 / 22 mpg (US)


digital instrument cluster (convertible only) $495
pearl white paint (convertible only) $700