Offered from 1987 to 1991, the RPO-B2K upgrade was available from any Chevrolet dealer and also Callaway’s first major Corvette tuning program.

Chevrolet was interested in Reeves Callaway after his successful Alfa V6 tuning and requested a similar program for the fourth generation (C4) Corvette. Together, they made the upgrade package a Regular Production Order (RPO) which was the first time GM had outsourced such an option to a specialist manufacturer. It even had a factory back warranty.

All cars were sent to Callaway’s facility in Limerock CT and were outfitted with the Twin Turbo package. The total cost of the upgrade was $19 999 USD which was added to base cost of a coupe ($27 999) or convertible ($33 172).

The B2K option was primarily an engine upgrade, but was comprehensive and used over 2000 new parts. The engine itself got new forged pistons, crankshaft, better lubrication system and four bolt main bearing caps. The induction system required a secondary injection system to retain the original emissions and fuel injection system.

As the C4 updated, so did Callway’s program. By 1988, the B2K was pushing 382 bhp and 562 ft. lbs. of torque. This was also met with a price increase which eventually topped out in $33 000 by 1991. Optionally available were 5-Spoke Dymag Wheels.

Later derivatives included the 880 bhp ‘Sledgehammer’ which went on to reach 254 mph. By the time Callaway stopped the B2K program in 1991, over 500 Corvettes had been converted. It was replaced by the Speedster.

1987 Callaway Corvette B2K Twin Turbo Images

See full 1987 Callaway Corvette B2K Twin Turbo gallery

In Detail

type	Professionally Tuned Car
built at	Old Lyme, Connecticut, USA
price $	$ 50,865
engine	Twin Turbo V8
position	Front Longitudinal
aspiration	Twin Turbo
valvetrain	Pushrod OHV
displacement	5733 cc / 349.8 in³
bore	101.6 mm / 4.0 in
stroke	88.4 mm / 3.48 in
compression	7.5:1
power	257.3 kw / 345 bhp @ 4000 rpm
specific output	60.18 bhp per litre
bhp/weight	221.72 bhp per tonne
torque	630.5 nm / 465 ft lbs @ 2800 rpm
body / frame	Fibreglass over Steel Chassis
driven wheels	RWD
wheel type	Optional 5-Spoke Dymag
front tires	275/40ZR17
rear tires	275/40ZR17
front brakes	Vented Discs w/ABS
front wheels	F 43.2 x 24.1 cm / 17 x 9.5 in
rear wheels	R 43.2 x 24.1 cm / 17 x 9.5 in
steering	Rack & Pinion w/Power Assist
curb weight	1556 kg / 3430 lbs
wheelbase	2443 mm / 96.2 in
front track	1514 mm / 59.6 in
rear track	1534 mm / 60.4 in
length	4483 mm / 176.5 in
width	1803 mm / 71 in
height	1186 mm / 46.7 in
transmission	4-Speed Manual
gear ratios	2.88:1, 1.91:1, 1.33:1, 1.00:1
final drive	3.07:1
top speed	~247.8 kph / 154 mph
0 – 60 mph	~5.0 seconds
0 – 100 mph	~12.4 seconds
0 – 1/4 mile	~13.7 seconds

1988 Chevrolet Corvette Callaway Convertible B2K Package 1G1YY3186J5102255 – sold for $2,500 Callaway Twin Turbo RPO B2K package original cost of $25,895 for this option. 1 of 125 built. GM used this car to promote the Callaway for 1 year. Original Callaway documentation. Even more rare being a convertible. This is the actual car that appeared in Playboy. Owner history includes the HaggenDas Family. From private collection and museum from original owner. 93,240 actual miles.