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.
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.
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.
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) |