What am I?: Rallysprint Class 3, 3A & 3B

This class has sub classes within it:

Class 3 is for 2 Wheel Drive Rally Cars from 1651cc up to 2100cc normally aspirated .

Class 3A is for Cars from 1651cc up to 2100cc with only 2 valves per cylinder.

Class 3B Cars from 1651cc up to 2100cc with more than 2 valves per cylinder.