The TR-4 series had an inline 4 cyl engine and the TR-6 had a straight six. All but the TR-C were Carbueretted. The C was fuel injected.
Triumph TR-7 was powered by a 1998 cc 4 cyl engine , adapted from the Triumph Dolomite Sprint saloon carIn my younger days I had a 1966 TR4A with twin SU carbs. My best friend had a 1966 TR4A with twin Strombergs. Never knew why the different set ups
