<P> In January 1990, the GM B platform was redesigned for the 1991 model year, though it retained the same shortened frame design of the 1977 model year redesign . The Impala SS badge was resurrected at the 1992 Detroit Auto Show as a concept car designed by GM designer Jon Moss . The concept car was two inches lower to the ground than the regular Caprice, and was powered by a 8.2 - liter (500 cu in) engine . Eventually, the concept car's engine was replaced with a 5.7 - liter (350 cu in) engine derived from the Corvette . </P> <P> The 1994 Impala SS went into production on February 14, 1994, at GM's plant in Arlington, Texas, and was almost identical cosmetically to the concept car, the only noticeable change being the chromed bowtie logo on the grill (vs a red logo on the concept). The car was, in essence, a high - performance version of the Caprice . It used the Caprice 9C1 police package as its base and as such got most of the equipment formerly available only to law enforcement and government agencies . This included a sport - tuned suspension with reinforced shocks and springs, a high - capacity reverse - flow cooling system (derived from the Corvette's LT1), four - wheel disc brakes, transmission cooler, dual exhaust, a higher - output electrical system, and other minor mechanical alterations . The Impala SS did not get the external oil - to - air engine oil cooler, nor were all the body mounts secured (the standard Caprice and Impala SS were assembled at the factory with the front three body mounts missing one of the rubber cushions, while the 9C1 was assembled with all rubber cushions in place). </P> <P> The Impala SS was fitted with a standard 3.08 gear . The limited - slip rear differential was standard (as opposed to the option G80 on Caprices) and the suspension was an inch lower . A retuned LT1 5.7 - liter (350 cu in) small - block V8 was standard on the Impala SS, making 260 hp (194 kW; 264 PS) and 330 lb ⋅ ft (447 N ⋅ m) of torque (retuned from the prototype's 300 hp (224 kW; 304 PS) rating). The primary difference between the LT1 in the Impala and the LT1 that was in the Corvette and Camaro was that the Impala engine was fitted with cast - iron cylinder heads instead of aluminum ones, and a camshaft that was designed more for low - end torque than high - end horsepower . Another difference was that the block casting for the Impala LT1 had two - bolt main bearing caps while the casting used for the Corvette LT1 had four - bolt main bearing caps . The transmission was the 4L60E, which was an electronically controlled version of the previously hydraulically controlled 4L60 . However, the transmission was not beefed up for the power of the LT1, and transmission failures after 100,000 miles (160,000 km) were commonplace . </P> <P> The Impala SS received body - colored trim, a unique single - bar grille with no hood ornament, and a rear deck spoiler . It was fitted with 17 - inch (430 mm) brushed aluminum wheels with 255 / 50ZR17 all - season Z - rated tires . Inside, the car came with a central console with cup holders (1994 and 1995 models) and a storage compartment, leather seats embroidered with the Impala SS logo, and a standard leather - wrapped steering wheel . For the 1994 model year, it was available only in black with a gray interior . Due to a shortage of the unique five - spoke aluminum wheels, only 6,303 cars were sold . However, the wheel shortage was remedied for the 1995 model year and 21,434 cars were sold . </P>

What engine is in a 1996 impala ss