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Callaway Corvette Buyers Tips

Although the search can be half the fun of finding a new (used) Callaway Corvette, once you find what you think is one, you want to be certain before laying out the money and taking title to the car. With over one thousand different components replaced or modified on the Twin Turbo Callaway Corvettes, they are very difficult to clone. SuperNatural™ Corvettes will require a bit more scrutiny, as they could be ordered in many forms and option levels.

The following information is designed and offered as a guide, and by using this information; you understand that no amount of information can take the place of common sense. The information is divided into two categories – Documentation and Identification. Please utilize all tools and information to make your purchase a successful one.

 – Happy (Callaway) hunting!

Documentation:

The value and history of the Callaway Corvettes makes it important to not only document the car throughout one’s ownership but, prior to one’s purchase, you should verify all paperwork & details about the car.

Twin Turbo Callaway Corvettes:

Before we look over the various paperwork, it should be explained that there were two ways a Callaway Twin Turbo Corvette could be constructed.          

While the bulk of the cars made during the run were ordered under the B2K option, many were what Callaway calls, “Direct Conversion” cars. Direct Conversion cars will carry the same parts and technology however, they will not have the RPO listed in the glove box, or on the paperwork.  Verification of cars can be handled through Callaway Cars in Old Lyme, CT. While your best source for documentation remains Callaway Cars in Old Lyme, Ct., there are some items you can check for, before you make your call.

Some sources of documentation are:

Ø The factory window sticker.

Ø Callaway supplemental window sticker.

Ø GM build sheet.

Ø Dealership “Quick-Spec” worksheet.

Ø Service Parts Identification label (in the center console).

 The option code B2K is found on the labels of Callaway Corvettes ordered through the Bowling Green Plant. Direct Conversion cars pulled from dealer stock, etc. will not list this code. 

SuperNatural™ Callaway Corvettes:        

SuperNaturals™ are documented a bit differently.

While some have Callaway window stickers, others may have invoices for their option content

Callaway Cars has a record of what cars were built, their options, and any updates handled through them based upon VIN #

A Callaway dyno sheet may be part of the paperwork an owner has, provided by Callaway Cars before delivery. Your best bet with regards to documenting a SuperNatural™ is a quick telephone call to the factory in Old Lyme to verify.

Identification:

Identifying a Callaway Corvette can be fairly straightforward however, there were some variations on the cars from year to year that you should be aware of.

The following section will illustrate these main points on identification of the Callaway Twin Turbo  Corvettes, and are divided by years and models.

Body

1987 Callaway Corvettes had subtle bodywork clues that indicated there was more underneath.

The most obvious Callaway change was the installation of twin NACA ducts on the hood. These ducts routed cold air to the intercoolers. Beneath the hood, there was various ductwork bonded to the underside.

While a 1987 is unique, 1988-1991 used a similar method, with small changes in design over the years.1988’s styling changed to a smoother “flat hood” design. The previous years NACA ducts were gone as the intercoolers now drew fresh air from beneath.

1989 and 1990 remained virtually unchanged from the 1988 revisions on the stock bodied cars however, mid-year in 1989, an exciting body option was introduced.

1989’s body option was called the AeroBody™. Designed as a complete package, it replaced to nose and tail caps and added revised side panels. The AeroBody™ continued to be an option on the B2K’s with no major changes to body design until 1991.

1991 saw a revised intercooler inlet design to the hood ducts and was part of the B2K package whether the AeroBody™ was installed or not.

Engine

On the Twin Turbo Callaway, the engine is fairly easy to identify. Minor changes were made, from year to year – emblem design and air inlet piping was the two obvious changes.

While there were literally hundreds of individual parts that went into the Callaway Twin Turbo Corvette, we will look at the major components in this section.

Looking under the hood of a Callaway Twin Turbo, the first thing you will notice are the two large intercoolers saddling the intake plenum.

The intakes were refinished by Callaway Cars with a black wrinkle finish and specific emblems on each side. In addition to those differences, a rare engine upgrade called the “100 plus”, was also available.

On the B2K engine, a unique series of numbers were stamped onto a pad on the block for identification. The numbers listed are on two rows:

The first row is the Callaway year & car number then below, the last four digits of the chassis VIN#

From underneath the car, you can see the twin turbochargers.

The turbos are located on either side of the oil pan and two versions were used during production.

In 1987, IHI brand turbos were specified for use on the B2K’s. Changing for 1988, Larger Rotomaster brand turbos were specified for use on the B2K’s.

Identification of the  1990 – 1996 Callaway SuperNatural™  Corvettes are a little different than the Twin Turbo model, here is how to tell them apart:

SuperNaturals™ could wear the stock bodywork, Callaway AeroBody™, or the exclusive Le Mans body.

SuperNaturals™ were offered in various outputs.

Based upon either the LT1 & LT4 or the LT5 engines, they had various horsepower levels.

During the SuperNatural™ run, a wide variety of wheels were offered.

Wheels from Dymag, OZ, RW, and the Callaway Run-Flat wheels were all offered in different sizes

Various emblems and plates were affixed to the SuperNatural™ Corvettes during production. Depending upon the year and model, placement and style may vary slightly.

On SuperNaturals™, a dash plate was typically affixed – depending on the year, the location may be beneath the radio or, under the passenger side glovebox / airbag.

Under the hood, another plate was installed on the throttle body, calling out the horsepower level of the SuperNatural™ engine installed.

On the exterior, there were Callaway inserts for the stock Corvette emblems, both front & rear.

“CALLAWAY SUPERNATURAL™” decals were also affixed to the rear glass – on coupes, one was on each side and on convertibles, on the rear window surface and specified the horsepower level of the car.

Callaway used two main styles of exhausts – The mufflers either exited in the standard rear position or on AeroBody™ cars, an optional “center exit” exhaust could be fitted.

The center exit exhaust had twin cans where the spare tire resided on the early cars, with later models fitted with a high polished oval exhaust can. The “Double D” tips, exited through a notch in the rear bumper cover.

Values:

Callaway Corvette Price Guide – 2008

Year

Body Style

Fair Condition

Good Condition

Excellent Condition

1987

Coupe

$17,000

$24,500

$32,000

1987

Convertible

$18,500

$27,000

$35,500

1988

Coupe

$19,000

$26,000

$33,000

1988

Convertible

$20,500

$28,500

$36,500

1989

Coupe

$23,000

$30,500

$38,000

1989

Convertible

$24,500

$34,000

$39,500

1990

Coupe

$23,500

$31,000

$37,500

1990

Convertible

$25,000

$34,750

$44,500

1991

Coupe

$26,000

$33,000

$40,000

1991

Convertible

$27,500

$37,000

$47,500

  Add for the following:

  • 20% For Callaway AeroBody™

  • 5% For Callaway Dymag 16” Magnesium Wheels (1987 Only).

  • 5% For Callaway Dymag 17” Magnesium Wheels (Add only for 1987 cars – Became Standard for 1988, through mid-1991 when replaced with O.Z. 17” wheels).

  • 15% for 1988 35th Anniversary Option.

  • $2,000 for Callaway WonderBar Air Inlet Upgrade.

  • Other Callaway options may include full leather interior, Brembo brakes, C.O.I.L.(over) suspension, and other upgrades that will add value.

Callaway SuperNatural™ Corvettes based upon either 1992 and newer LT1 or LT4 Corvettes, or 1990 and newer LT5 Corvettes are often difficult to place a hard value on due to many variables in option content.

In general, SuperNatural™ engine packages double the value of a comparable regular Corvette. Additional Callaway offered options included the Callaway AeroBody™, Brembo brakes, C.O.I.L.(over) suspension, full leather “Speedster style” interior, and special paint colors will all contribute to greater values. 

It should also be noted, that while there are certainly cars above excellent condition and their values will be higher than those shown, there may also be a car with conditions below fair. While cars above excellent condition are seldom driven, or as new, a car below fair may have a history or reason for its lower value and may not automatically be a bargain.

  *Again, please remember that the above is to be used as only a guide – if you have specific questions regarding a car and its potential purchase, feel free to drop an e-mail or contact Callaway Cars directly for more information. If you have any additions to the above guide, please let us know – Thanks.

© 2004 - 2008 Chris Chessnoe & CallawayOwnersGroup.com – no unauthorized reprinting or usage granted without written permission by the author.

 


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