420/425/430
Two years after Biturbo introduction was unveiled a four-door family version. This version has a longer wheelbase, 2.6 metres (100 in). The four-door version was replaced in 1994 with the Maserati Quattroporte IV.
Versions:
| Model | Years | Engine | Displacement | Power | Fuel system | Notes |
|---|---|---|---|---|---|---|
| 425 | 1983-89 | V6 ohc | 2491 cc | 200 hp | carburetor, turbo | |
| 420 | 1985-88 | V6 ohc | 1995 cc | 180 hp | carburetor, turbo | Only Italy |
| 420i | 1986-88 | V6 ohc | 1995 cc | 190 hp | Fuel injection, turbo | |
| 420 S | 1986-88 | V6 ohc | 1995 cc | 210 hp | carburetor, turbo | Only Italy |
| 430 | 1987-90 | V6 ohc | 2790 cc | 225 hp | Fuel injection, turbo | Catalysator |
| 425i | 1987-90 | V6 ohc | 2491 cc | 188 hp | Fuel injection, turbo | Catalysator |
| 422 | 1988-90 | V6 dohc | 1996 cc | 220 hp | Fuel injection, turbo | Catalysator |
| 4.18v | 1990-94 | V6 ohc | 1995 cc | 220 hp | Fuel injection, turbo | Catalysator |
| 4.24v | 1990-92 | V6 dohc | 1996 cc | 245 hp | Fuel injection, turbo | Only Italy |
| 4.24v II | 1991-94 | V6 dohc | 1996 cc | 240 hp | Fuel injection, turbo | Catalysator |
| 430 4v | 1991-94 | V6 dohc | 2790 cc | 279 hp | Fuel injection, turbo | Catalysator |
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