1991 Firebird Formula 350 WS6 Convertible Firehawk

Firehawk decal


This 1991 Firebird Formula 350 WS6 Convertible is believed to be 1 of 1. I purchased this Firebird from an estate which had one of the largest Pontiac collections in the country. I was told the collection consisted of over 1000 cars. Unfortunately, the previous owner passed and thus the selling off of the collection became the responsibility of the wife and son, which had very little knowledge of the vehicles and documentation. I was told that most of the collection went to a museum.

Although I didn’t get much in the form of documentation, the serial number is that of a Formula 350, and according to the RPO codes, the car is equipped with many of the preferred performance options. This is indeed a Formula 350 WS6 handling package optioned car. The car has front and rear disc brakes, RPO code J65. The fronts and rears are slotted and drilled, the fronts are 13″ diameters. The chassis has an abundance of braces, a must for F-body convertibles. The car drives as solid as any fixed roofed F-body I have ever driven. The polished aluminum valve covers are engraved with the words ” Pontiac Performance Motorsports Division” I tried my best to investigate this further and have come up with very little information, although google did find some information on a group of General Motors, Pontiac engineers that worked on a special project which included several Firebirds.

The exhaust consist of true dual stainless attached to the dual cats. The intake runners are the SLP’s siamese. There’s also a alteration modification information plaque in the engine bay, with the formulas VIN number. For what it’s worth, from some of the very limited documentation I got with the car, it does show that this car was originally titled in Detroit Michigan. Back in 1991 I purchased a Pontiac GTA which was ordered for one of the executives within the Pontiac division, and it also was originally titled in Detroit.

The Firehawk decal kit came with the car, but were not installed. I took the liberty of installing them as they finish the looks of this car perfectly.

Regardless of the documentation, this is a very rare bird with many cool performance goodies. At car shows, it’s definitely a crowd pleaser.

























gm info plate

slp runners1

slp runners2

slp runners3

slp runners4






1991 Corvette ZR1

1991 Corvette ZR-1 RPO ZR1

zr1 emblem

The Corvette ZR1’s have a long performance heritage. The first Corvettes produced with the ZR1 factory code, were within the C3 generation Corvettes, but the ZR1 were only produced between 1970-1972 out of the entire run of the C3 generation, which ran from 1968 -1982. These first ZR1’s received the best performance accessories G.M had for the time period. Things like racing suspension, brakes, stabilizer bars, and other high performance components to LT-1 cars. From there, the ZR1 did not exist till 1990, when G.M finally released the long awaited beast.
Again, having the ZR1 emblem on your Corvette meant that you were driving around in the most high performance machine America produced. The new engine was called the LT5, and is an all aluminum 349CID/5.7 Liter 32 Valve piece of engineering that has yet to be matched anywhere on earth. Between 90-92, the motors were rated at 375 hp, with a near 7000RPM red line, yet have more reliability and endurance over any high performance engine ever produced in this country to date. The ZR1 is known for its top speed endurance record, where the car went at speeds over 175MPH, non- stop, for 24 hours. There are NO American cars that can do this except the ZR1 to date! The ZR1 truly is a race car on the street and has the endurance to go from coast to coast as fast as possible without breaking, if there were no speed limits. The LT5 was so radical, that GM could not even produce it, themselves. It was partially designed by Lotus, but was actually hand build by the Mercury Marine Company in Stillwater Oklahoma… A totally off the wall move by GM, which has never been done again.
From 1990 to 1995 GM/Chevrolet produced the end result of one of the most radical projects ever done by the very conservative company. The LT5 ZR1 32V Dohc “King of the Hill” Corvette! The total number of cars from 1990-1995 were only 6939 for all the years combined, making all of them quite a rare piece of machinery. The sticker on these cars were right about $70,000 USD and went up a bit as the years went on, making it affordable to only a few. From 1990-1992, the LT-5 was rated at 375hp and the hp was upped to 405 from 1993-1995. The tell tale sign of a ZR1, is its extreme width in the back. You cant miss it! It is 4″ wider that a regular corvette from the same generation, and uses the massive 315/35/17 tires on 11″ wide wheels. The rarest of ZR1’s were between 1993-1995 as only 448 units were made each year. All ZR1’s came fully loaded and all had some very interesting hardware. The oil cooling system for example was larger than most cars entire cooling system. The car has a special version of the German built ZF 6 speed transmission, another radical move on GM. The car has a self adjusting suspension, known as RPO code “FX3” which has 3 selections, Tour, Sport and Performance, which can be changed with a simple turn on a switch. Another cool feature for the ZR1, was the valet switch. This switch allowed you to limit the power output of the engine, at the turn of the key. A very handy feature indeed, for those rare times, that someone other than yourself had to drive the car.
My 1991 ZR1 was ordered in Arctic White with a Red Leather interior. What makes this car extra rare, is the fact that it was ordered as an export model RPO code Z49. There were only 152 produced out of the 2044 production that year. Export models had automatic headlights , as well as dash gauges with Euro markings. These cars are destine to be among the most collectible of Corvettes, as never before and most likely never again will a Corvette possess an all aluminum dual overhead 32 valve V8. The sound of this engine going through the gears, is nothing short of pure ecstasy.

DCP_086691 rearDCP_0848DCP_0971F1eng top viewdriver door intpass door intrear int viewrear deck bose  grillrear deck pass sidecanadian decalrear window decalrotor 2white zr1 094white zr1 055white zr1 093white zr1 106white zr1 058white zr1 061white zr1 114white zr1 072white zr1 070nose to nose

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.



1991 Pontiac Firebird GTA

1991 Pontiac Firebird GTA Drivers Panel View

The Trans Am GTA – Gran Turismo Americano RPO Y84

Some say, that the name Gran Turismo Americano had to do with Pontiac wanting to connect to the Euro concept which was used to market the brand. I like to think that the GTA stands for Grand Trans Am’s, since the GTA’s were for the most part, the top of the line from the Firebird line.

The GTA was produced from 1987 to 1992 when the 3rd generation “F” bodies came to an end of production. All GTA’s were equipped with Tune Port Fuel Injection, all came with the Gold Mesh wheels reminiscent of the old 1978-79 Trans Am wheels.

Another distinction to the GTA, is that they were never built as a convertible. For the interior, all GTA’s came with articulating bucket seats, the most comfortable sports seats, I have ever sat in, available in either cloth or the optional leather.

From 1987 – 1990 all GTA’s looked virtually the same. In 1991 Pontiac revised the look of the Firebird, so, 1991 and 1992 the final year of the F-body looks different from the rest. For 1991, only 2035 GTA’s were produced for America and 48, for Canada. In 1991 I had owned a very rare GTA, as it was equipped with the high output 305 Tune Port and a 5 speed manual. According to G.M about 160 of those were made. The High Output 305 came with dual cats, and the Hp rating was just 10 shy of the 350. Needless to say, that was a fun car to drive.

To top it off, that car was originally made for a top Pontiac Executive and was auctioned off with less than 1000 miles. To this day, I’m almost certain, that, that particular car got special treatment, as it was able to pull away from Corvettes of the same model year equipped with the 350ci power plant, G.M’s top of the line sports car.

The current GTA in my collection, is equipped with all the performance goodies, including RPO code J65 Front and rear disc brakes. The power plant RPO code L98 5.7 ltr. With RPO N10 dual exhaust rated at 245 hp, just 5 hp shy of the same model year Corvette and 350 ft.lbs.

The Exterior paint is the RPO 45U Medium Green Metallic with an Interior RPO 662 Beechwood (tan) leather. In my opinion, one of the best color combinations for the GTA, as all the emblems match the gold color of the mesh wheels. The contrast of the Green metallic paint with tan leather and gold mesh wheels, makes for the perfect color combination.

As usual, the only thing missing on this car, is T-Tops which I refuse to own, as these are the weakest structurally of the F-bodies. Car was ordered with the optional cd player, although my pictures don’t show it. The previous owner wanted the ability of plugging in MP3’s and did not want to modify the original radio, thus the original radio has been boxed up. The current radio has the cassette option and has been modified for MP3, plug up.