a detuned 135 hp (101 kW) version of the Buick-derived Rover V8 engine . The 3.5 litre (3528 cc) engine was bored out to a displacement of 3.9 litres (3947 cc) for the 1990 model year, and 4.2 litre (4275 cc) in 1992 (1993 model year ) for the Long Wheelbase