The primary American racing effort was mounted by the Sunray DX Oil Company (later Owens-Corning Fiberglas Racing Team), running C3 Corvettes sponsored by the DX fuel brand. At the 1968 Daytona 24 Hours, two DX Sunray entries with C3 Roadsters started: car number 29, driven by Peter Revson and Don Yenko, finished 25th; car number 30, driven by Jerry Thompson and Tony DeLorenzo, finished 27th. Both cars used 7,261 cc Chevrolet V8 engines with Goodyear tyres.
At the 1968 12 Hours of Sebring, the Sunray DX entry, driven by Hap Sharp and Dave Morgan, achieved a 6th place overall finish and 1st in class in the GT+5.0 category — one of the C3's strongest early endurance results.
Tony DeLorenzo and Jerry Thompson became the leading American C3 campaigners through 1969 and 1970, running the car under the Owens-Corning Fiberglas banner. DeLorenzo won the SCCA Road America June Sprints in 1969. At the 1969 Watkins Glen 6 Hours, DeLorenzo and Dick Lang finished 7th overall and 1st in the GT+2.0 class. At the 1970 Daytona 24 Hours, Thompson and John Mahler finished 6th overall and 1st in GT+2.0. At the 1970 Sebring 12 Hours, DeLorenzo and Lang finished 10th overall and 1st in GT+5.0. Thompson won the SCCA American Road Race of Champions at Daytona in November 1969.
The main European effort was conducted by Scuderia Filipinetti, the Swiss privateer operation, and the French Greder Racing team run by Henri Greder.
Scuderia Filipinetti entered two C3s for the 1968 Le Mans 24 Hours. Car number 3, driven by Henri Greder and Umberto Maglioli and running the chassis later identified as 194378S410300, retired with a head gasket failure, having qualified 26th (3:59.8). Car number 4, driven by Sylvain Garant and Jean-Michel Giorgi, did not finish after an accident, having qualified 30th. Filipinetti returned with the same primary chassis for Le Mans 1969, driven by Greder and Reine Wisell (with Ronnie Peterson listed but not starting), retiring from gear-selection problems.
Henri Greder's own team became the most persistent European C3 entrant. At the 1969 Tour de France Automobile, Greder and André Vigneron drove chassis 194378S410300 to 2nd overall and 1st in the GT+2.0 class. Greder continued to campaign the car through 1970, contesting Le Mans (where Ecurie Léopard ran a related entry into a DNF from an accident), the Paris 1000 Kilometres at Montlhery (10th, co-driven by Marie-Claude Beaumont), and the Tour de France 1970, where the car retired with piston failure.
The Belgian partnership of Chris Tuerlinckx and Etienne Stalpaert entered a C3 at the 1969 Spa 1000 Kilometres, finishing 23rd overall but 1st in the GT+5.0 class.
Racing C3s were powered by Chevrolet V8 engines displacing between 6,492 cc and 7,261 cc depending on year and entrant, in naturally aspirated form with overhead valve configuration. The cars ran in closed hardtop bodywork for endurance events and open bodywork in SCCA sprint classes. Tyre suppliers included Goodyear, Firestone, Dunlop, and Bridgestone depending on team and year. The front-engined, rear-wheel-drive layout was retained throughout. Class designations in international events were assigned by engine displacement: GT+2.0 covered cars over two litres; GT+5.0 covered the largest-engined GT entrants.
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