The Triumph TR line was all about evolution and refining of the breed – so although there was very little to distinguish the TR3 from the TR2 it was usefully improved. The new name gave more clues to the improvements than the oh-so similar styling, but behind the new egg-crate grille covering the radiator-cooling intake was a more powerful engine, developing 5bhp more than its previous incarnation, thanks to its bigger SU carburettors. In addition to that, a Le Mans-type head available, which upped the power to a handy 100bhp. Ream more - https://classics.honestjohn.co.uk/reviews/triumph/tr3/