Belloc started racing in single-seaters and won the French Formula Renault Championship in 1992, at his second attempt, after four wins. Moving up to the French Formula Three Championship in 1993, he took the title the following year with five wins. He raced in Formula 3000 until 1997.
After a few seasons with occasional races in the French Porsche Carrera Cup, he became a full-time sports car racing driver in 1998, when he was third in the Carrera Cup. The following year he became a Chrysler works driver, in the Oreca Chrysler Viper GTS-R, and took third place in the FIA GT Championship, also racing in the American Le Mans Series. In 2001 he became FIA GT Champion, also winning the Spa 24 Hours.
From 2002, Belloc raced mainly in the ALMS, for Carsport America, but also took part in the French Supertouring Championship, FIA Sportscar Championship and FIA GT Championship. In 2006 he drove occasionally in the FIA GT, ALMS and Le Mans Series, where he took an LMP2 class win at the 1000 km Istanbul. For 2007 he drove an Oreca Saleen S7-R in the 24 Hours of Le Mans.
24 Hours of Le Mans results
|1997||La Filière Elf|| Henri Pescarolo
|1998||Courage Compétition|| Didier Cottaz
|1999||Viper Team Oreca|| David Donohue
|Chrysler Viper GTS-R||GTS||271||DNF||DNF|
|2000||Mopar Team Oreca|| Yannick Dalmas
|2001||Larbre Compétition|| Christophe Bouchut
|Chrysler Viper GTS-R||GTS||234||20th||4th|
|2002|| Equipe de France FFSA
| Jonathan Cochet
|Chrysler Viper GTS-R||GTS||326||14th||3rd|
|2007||Team Oreca|| Laurent Groppi
|2011||Larbre Compétition|| Christophe Bourret
|Porsche 997 GT3-RSR||GTE
|2012||Larbre Compétition|| Christophe Bourret
|Chevrolet Corvette C6.R||GTE
|2016||Larbre Compétition|| Pierre Ragues
|Chevrolet Corvette C7.R||GTE