A new RPO Z52 "sport" handling package combined elements of ZS 1 with the softer suspension of base models. The RPO Z52 package was refined to include structural enhancements developed for the convertible, and a finned power steering fluid cooler.   RPO Z52 also included the radiator boost fan, Bilstein shock absorbers, engine oil cooler, heavy-duty radiator, l6x9.5-inch wheels, faster 13:1 steering ratio, larger front stabilizer bar (except early production), and the convertible-inspired structural improvements for coupes.   Z52 was available with coupes or convertibles, automatic or manual transmissions.  

The overdrive-engage light was moved from the center-dash area (1984-86) to an easier-to-view location within the 1987 tach display.   Electronic air conditioning control (RPO C68) became an available option for coupes and convertibles in 1987; in 1986, it was coupe-only.   New 1987 convenience options included and illuminated vanity mirror (D74) for the driver's visor, and a passenger-side power seat base (AC 1). Twin remote heated mirrors became available for convertibles as RPO DL8. The heated mirrors were included with the heated rear window in the RPO Z6A defogger option for coupes.   Convertibles and early coupes had outside mirror air deflectors.  

The Callaway Twin-Turbo engine package introduced in 1987 was not a factory-installed option, but could be ordered through participating Chevrolet dealers as RPO B2K, adding $19.995 to the price.  (The Callaway required the Z51 Handling Package.)   Fully assembled Corvettes were shipped from the Bowling Green Corvette plant to Callaway Engineering in Old Lyme, Connecticut, for engine and other modifications.   The 1987 Callaway had ratings of 345hp and 465 lbs.-ft torque, and reached a top speed of 177.9 mph with .60 overdrive gearing.   The first four 1987 Callaways used replacement LFS (truck) shortblocks, but subsequent cars had reworked production Corvette engines.  

All 1987 Callaways had manual transmissions, though not an official option, two of the 1987’s were equipped with automatic transmissions.   None were certified for California sale. Of 184 twin-turbos built in 1987, 121 were coupes, 63 were convertibles.   167 cars were ordered with RPO B2K, while Callaway records show 188 cars constructed.   You may have also seen the number of cars built listed as 184 (121 Coupes & 63 convertibles) however, four more cars were produced bringing the overall total to 188 Callaway Twin Turbo's for 1987 (123 coupes and 65 convertibles.