The car was an evolution of the Chevron B26, and was initially fitted with a 2-litre Hart 420R straight-four engine producing 290 hp (216.3 kW; 294.0 PS).

[1] For the suspension, the B31 featured double wishbones, coil springs over dampers with an anti-roll bar at the front, and single top links, twin lower links, twin trailing arms, coil springs over dampers with an anti-roll bar at the rear.

[6] The car's next international event was the 800 km of Dijon, where KVG Racing were the only team to enter a B31; they took third overall, and the Sports 2000 class victory.

[20] For the Coppa Florio Pergusa, Francisci and Bruno Del Fante entered the only B31 of the event, a 1.3-litre Cosworth-engined car; the team failed to make the start of the race.

[22] At the 200 miles of Salzburgring, it was a similar story; Zanuso and Blanckley retired the DFV-engined car due to a halfshaft failure.

For the 500 km of Dijon, Tom Charnell and Ian Bracey drove a Hart 420R-engined B31, but retired due to a flywheel failure after 14 laps.

[31] A 2-litre Cosworth FVD-engined B31 was then entered by Chandler Ibec International-Team Lloyds at the 1977 24 Hours of Le Mans, the first time a B31 had been used in the endurance event.

[16] Charnell, Bracey and Robin Smith were selected to drive the car, but the team retired after 21 laps due to a fuel pump failure.

In the opening round of the ESC season, which was the 300 km of Nürburgring, Raymond drove his DFV-powered car to ninth place, and second in the Sports 2.0+ category.

[37] Charnell and Smith were partnered by Fréderic Alliot and Richard Jones for the 24 Hours of Le Mans, but their race was strewn with problems, and the 181 laps they completed were insufficient for them to be classified.

[38] Secondo Ridolfi and Grassi were the only two to use a B31 at the Coppa Florio Pergusa, the fourth round of the ESC season, and they finished sixth.

Nesti was the solitary B31 entry in the 6 Hours of Mugello, which was the second round of the WCM; however, he did not compete in the B31, instead driving a BMW 320i with Luigi Moreschi.

[40] Ridolfi partnered Roberto Marazzi in the 1000 km of Monza, which formed part of the Italian Group 6 Championship; they took their 1.6-litre Ford-engined car to fourth overall, and won the Sports 1600 category.

[45] Götz and Blanckley then entered the 1000 km of Nürburgring, and brought their BMW-powered B31 home in 15th overall, and won the Sports 2000 category.

[50] Jones and Barrie Williams then ran a 2-litre BDG-powered B31 at the 6 Hours of Silverstone, but the race was far from trouble-free, and the 141 laps that they completed were not enough to be classified.

[52] The B31's best finish of 1981 came at the sixth round of the Interserie championship, held at Nürburgring; Götz brought his DFV-engined car home in seventh overall, and fourth in the Sports 2000+ class.

Despite the fact that the B31 was now seven years old, it was still fairly successful in the Interserie; Götz finished sixth overall, and second in Division II, at the opening round of the season, held at Nürburgring.

He started his season by taking seventh overall in the fourth round of the Deutsche Rennsport Meisterschaft (DRM) series, held at Mainz-Finthen; he was the fastest of the three Group 6 entrants.

[78] In 1988, Gérard MacQuillan entered himself and Williams in a 2-litre BMW M12-engined B31/36 in the fourth round of the BRDC C2 Championship, held at Oulton Park; they finished ninth, and last.