use since the wagon series was downsized from the C-body in 1977, yet was three inches shorter than the 1990 model. The Roadmaster sedan, a C-body vehicle over its eight previous generations, shared the B-body for the first time in its history. Nonetheless, it stood not only as the largest Buick, a full 10 inches longer with a 5 inch greater wheelbase than the apparent top-of-the-line C-bodied Buick Park Avenue, but larger both in wheelbase (2 inches) and overall length (6 inches) than the K-body Cadillac Sedan de Ville. Powertrain The standard engine for the 1991 wagon was a 5.0 L L03 Chevrolet small-block V8. It was replaced a year later with a 5.7 L L05 Chevrolet small-block V8 shared by both wagon and sedan. In 1994 both received a substantial power and performance boost with an upgrade to a modified version of the advanced 5.7 L sequential point fuel-injection LT1 V8 introduced two years earlier in the C4 Corvette. Coupled with standard dual exhaust, it increased output to . This version of the LT1 was shared with a limited range of B-and D platform luxury and performance cars such as the Chevrolet Caprice Police Package and Cadillac Fleetwood, as well as specialty versions of GM's two F-bodied pony cars, theChevrolet Camaro Z28 and Pontiac Firebird Trans Am. Engines used in luxury cars had iron instead of aluminum heads for durability, camshafts tuned for increased low-end torque, and intake silencers to decrease engine noise. While installed in part to better comply with emissions and fuel-economy standards, the LT1 V8 not only offered an 80 hp power increase but raised rated fuel economy by 1 mpg, to 17 mpg city/25 mpg highway. As a result of this significantly boosted engine output General Motors limited the softer-riding Roadmaster (which ran on lower speed-rated tires than used on the Corvette) to a top speed of . For 1996, the LT1 became OBD-II compliant. All three Roadmaster V-8s were paired to a four-speed automatic transmission. In 1994, the hydraulically-controlled 4L60 (700R4) transmission was replaced by the electronically controlled 4L60E. When ordered with the factory towing package, the 1994-1996 Roadmaster was rated to tow up to . For the station wagon, this could be raised to 7,000 pounds with the use of a weight-distributing hitch, dual sway controls, setting rear tire pressure to 35 PSI, and disabling the Electronic Level Control. The towing package added