1991 Callaway Corvette Twin Turbo Convertible (1 of 6)

1991 Callaway Corvette Twin Turbo Convertible Driver Side Distanced

1991 Callaway Corvette Twin Turbo Aerobody RPO B2K

Callaway logo

This is 1 of 6 ever produced. This car was originally built through the G.M. rpo B2K option order, for the manufacturer of Dymag Wheels. Dymag Wheels were offered on the 87-early 91 Callaway Twin Turbo¬† cars. Wheels were made of magnesium, although in the last batch of production, Callaway switched to the OZ racing line which were applied on the ultra rare Callaway Twin Turbo Speedsters. Callaway Corvettes with the Aerobody package were aerodynamically capable of hitting 190+ mph. Hitting these speeds in a production vehicle was unheard of at the time. Also unheard of was the price tag of this car, as it had a window sticker of $121k, making it the most expensive GM car of the day. Again, we’re talking about 1991 money. In today’s money, this amount would equate to $180k+. Because of the break up between Callaway and the owner of Dymag, this car was sold to its European owner, the famous Phillipe Charriol, a well-known Swiss Jewelry/Watch designer and manufacturer who was also a very well respected race car driver in European circles.

 

1991 Callaway Corvette Twin Turbo Engine Performance Specs:

  • 403 hp (301 kW) and 582 lb ft (789 N x M)
  • Special Engine Prep and Components:
  • Splayed 4 bolt mains
  • Forced Gas Nitrided Crankshaft, 60Rc Journal Hardness
  • Proprietary Mahle Forged Pistons with 7.5:1 compression; Plasma Moly Ring Package
  • Dry sump pump for turbo oil scavenge and polished air inlet castings
  • Balance and Blueprint Operations Include:
  • Magnaflux Block and Crank Assembly, crankshaft journals cross-drilled and micropolished
  • Aluminum cylinder heads decked; line bore main bearing caps and block; decks squared to crank centerline; all galleries cleaned and replugged; valve springs shimmed for equal pressure, and all threads chased.

Production for 1991:

There were 62 ordered in this last year of Twin Turbo production. In total, 492 B2K Callaway Twin Turbo Corvettes were ordered through the normal sales channels. Of these, less than half were convertibles and of those, 6 were ordered through GM with the new Aerobody.

The most famous of the Callaway Twin Turbo was the 1988 prototype named “The Sledgehammer”. The Callaway Sledgehammer Corvette held the World Street Legal speed record of 254.76 mph.

The special edition Callaway Twin Turbo Corvette was available from 1987 to 1991 as Regular Production Option (RPO) B2K and could be ordered from select dealers in the U.S.. Corvette orders with the B2K option selected were shipped to Callaway Cars in Old Lyme, Connecticut, for the Twin Turbo conversion directly from the Bowling Green assembly plant.

Once converted and tested, the Callaway Corvettes were then shipped to their ordering dealers for final delivery to their respective owners. Dealer repairs of the Callaway Twin Turbo Corvettes were covered by the standard GM 12 mo./12,000 mile warranty, with Callaway Cars, Inc. reimbursing dealers for the time and materials on repairs to the added components. This was the only time when GM has allowed a factory order able non-GM performance enhancement on the Corvette.

From 1987-1991, a total of 497 (B2K) Callaway Twin Turbo Corvettes were ordered through the normal sales channels, making the Callaway Twin Turbo Corvettes some of the most collectible and rare Corvettes in history.