Nor'Easter

Callaway Cars and Chevrolet celebrated the 25th anniversary of the legendary B2K Twin Turbo Corvette by producing a limited run of 25 supercharged C6 Grand Sports.

June 12, 2014

Also from Issue 91

  • 1968 L88 Convertible
  • Buyer’s Guide: $20K
  • 1963 Split-Window Coupe
  • History: Frank Winchell
  • 2015 Model-Year Preview
  • Racing: Long Beach, Laguna Seca
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Callaway Cars’ unique relationship with Chevrolet began in 1987. It was then, and remains to this day, the only company whose Corvette performance modifications were codified into a regular production option package. By choosing option B2K, buyers got an extensively reworked, twin-turbo Corvette that delivered true supercar performance on par with the fastest cars from Ferrari, Porsche and Lamborghini. Between 1987 and 1991 a total of 510 of the legendary B2K Callaway Twin Turbo Corvettes were produced.

As the 25th anniversary of the B2K approached, Reeves Callaway began thinking of ways to celebrate the occasion. The company founder wisely concluded that the best way to mark this quarter-century milestone was to do it all over again, incorporating all that his company has learned in the intervening years into another B2K option package. The result was the building of 25 very special 25th Anniversary Limited Edition Callaway Corvettes.

Each 25th Anniversary Edition car began life as either a Grand Sport coupe or Grand Sport convertible, and the entire run of 25 cars was assembled in the Bowling Green Assembly Plant on April 5, 2012. Buyers could have any color they wanted as long as it was Cyber Gray Metallic. Convertibles were fitted with black cloth tops, while coupes got Carbon Flash-painted roof and halo panels. From Kentucky, these cars were shipped a thousand miles to Callaway’s facility in Old Lyme, Connecticut.

Once at Callaway, the bodies were modified with carbon-fiber parts manufactured using a proprietary epoxy resin infused/transfer-molded technique. A large, vented “power dome” bulge was incorporated into the hood to provide necessary clearance and cooling for the modified engine. High-speed handling and stability were enhanced courtesy of a carbon-fiber aero package, consisting of a front splitter, rocker-panel extensions and a rear spoiler. And just so there’s no mistaking exactly what the car is, all of the Corvettes were fitted with 25th Anniversary fender emblems and graphics etched on the windows, as well as an underhood build plaque with the car’s VIN and special B2K serial number.

Two of the 25 Callaway 25th Anniversary cars were ordered with a 3LT interior package while the remaining 23 got the full-boat 4LT kit. Callaway added floor mats embroidered with its logo, and leather, Alcantara and carbon-fiber trim to the steering wheel, airbag cover and center stack assembly. In addition, the shifter and emergency-brake handle were wrapped in Alcantara. The leather and Alcantara were stitched with red thread for 4LT interiors or black for 3LT interiors. Stock door-sill covers were replaced with new ones bearing the 25th Anniversary designation, and a plaque with the car’s B2K serial number was affixed to the bottom of the center stack.

With the addition of a Roots-type Eaton TVS2300 supercharger system, Callaway technicians dramatically increased the stock LS3 engine’s output—from 430 to 620 horsepower and 400 lb-ft to 555 lb-ft of torque. A Callaway Honker intake manifold and Double-D exhaust system replaced the stock parts. Because the supercharger significantly increases cylinder pressure, the stock head bolts gave way to high-tensile-strength studs and nuts. Callaway also installed aluminum 1.80:1 ratio rocker arms, stiffer valve springs and stronger push rods. Higher power production requires considerably more fuel, so Callaway added a new fueling system that includes a high-flow fuel pump, larger lines and larger injectors. The injectors were beautified with carbon-fiber covers adorned with 25th Anniversary graphics.

The stock C6 Corvette chassis leaves little room for improvement, at least with a street-going car, but that didn’t stop Reeve’s boys from sprinkling a little Callaway pixie dust on it. They drew upon their extensive experience testing and racing at the Nürburgring to develop very finely tuned damper assemblies in conjunction with Bilstein. Manufactured in Germany, the dampers were precisely matched in sets of four and assigned specific serial numbers for each car. Ride height was reduced by 20 mm and a 25 mm front-to-rear rake was established. Callaway’s stiffer front and rear anti-roll bars replaced the stock Chevy parts. Unique Callaway-designed rims were each carved from a single billet of forged aluminum. After plating with a liberal dose of black chrome, they were shod with either Michelin Pilot Sport PS2 ZP or Pilot Sport Cup tires, the latter being a no-extra-cost option. Either way, the fronts measure 285/30ZR19, the rears 335/25ZP20.

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