A new introduction for the 1975 model year, Chevrolet's Monza was in direct competition with Ford's Mustang and other sporting models, including those of other General Motors brands that used the same basic 2+2 bodyshell. The latter had a radical new fastback look, reminding some observers of the Ferrari 365 GTC/4. The Monza was available with a wide variety of power plants ranging from a 2.3-litre inline four via a 3.2-litre V6 all the way up to a 5.7-litre small block V8.

Chevrolet Monzas participated in the International Motor Sports Association (IMSA) North American GT Series in the new All-American Grand Touring (AAGT) class, competing with, among others, the hitherto dominant Porsche 911 Carreras. The AAGT regulations were very liberal, requiring only the bare minimum of original components be retained: basically just the windscreen, rear window and roof.
The result was some very dramatic-looking race-cars bearing only a passing resemblance to their road-going cousins.

The most successful Monzas were those prepared with factory backing by Lee Dykstra and American-based Australian Trans- Am driver Horst Kwech at Dekon Engineering. Development had begun late in 1974 when DeKon received Chevrolet's assistance in developing the racing Monza's tubular chassis frame.

DeKon's Monza racers used the largest available engine - a 5.7-litre V8 - which when tuned and equipped with fuel injection produced around 600bhp. 6.0-litre engines and Weber induction were used also.

The DeKon Monza made its racing debut at Road Atlanta on 20th April 1975 with Kwech driving but crashed. Nevertheless, the Monzas proved fast and competitive from the start, and after a promising debut season were ready for greater things in 1976. The man to realise the Monza's full potential would be Al Holbert, IMSA racer and a future Le Mans and Daytona 24 Hours winner, who took seven victories on his way to lifting that year's IMSA Camel GT Championship. Five victories in 1977 saw him IMSA GT Champion for the second successive year. Holbert then moved on to Porsche but the Monza remained active in IMSA racing well into the 1980s, although there would be no more championship wins. Of the original 18 DeKon Monzas built, it is believed that only one or two have survived.

This Monza was built as close as possible to original IMSA specification by a French privateer circa 2008 and has been campaigned extensively. A regular production chassis from 1977 was used, though on the HTP the car is dated 1975. The GM V8 engine produces around 650bhp and the Monza has proved to be very competitive, capable of running with Porsche 935s and the other cars of its era.

We are advised by the car's race engineer that it is very fast; indeed, out of four outings in 2021, it was racing in the top three on four occasions. In a very active racing career, the Monza has also competed at Le Castellet in 2017 and at Dijon in the Classic Endurance series in 2018/2019, and put in some strong performances at the Le Mans Classic between 2016 and 2019. More recently, in June 2021, the famous Belgian racing driver Marc Duez drove this car in the Belcar Historic Cup at Spa Francorchamps, winning the race and setting the fastest lap at 2m 40.138s! This Monza was also driven to a 3rd place finish by Frederic Bouvy at the Circuit Paul Armagnac à Nogaro in July 2021.

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An exciting prospect for the historic-racing competitor, this spectacular IMSA Monza comes with an FFSA Passport dated 2010 and HTP dated 2014. Up-to-date FIA papers have been requested and the application is pending approval by the FIA.