BMW 3 Series (E21)
Engines

Model
Years
Headlights
Engine
Power
Torque
315
1981-1983
Single
M10 (M98) carb I4
55 kW (74 bhp) at 5,800 rpm
110 N⋅m (81 lb⋅ft) at 3,200 rpm
316
1975-1980
Single
M10 (M41) carb I4
66 kW (89 bhp) at 6,000 rpm
123 N⋅m (91 lb⋅ft) at 3,000 rpm
316
1980-1981
Single
M10 (M118) carb I4
66 kW (89 bhp) at 5,500 rpm
-
318
1975-1980
Single
M10 (M118) carb I4
72 kW (97 bhp) at 5800 rpm
143 N⋅m (105 lb⋅ft) at 4,000 rpm
318i
1980-1981
Single
M10B18 injected I4
77 kW (103 bhp) at 5,800 rpm
148 N⋅m (109 lb⋅ft) at 4,500 rpm
320
1975-1977
Twin
M10 (M43) carb I4
80 kW (107 bhp) at 5,800 rpm
157 N⋅m (116 lb⋅ft) at 3,700 rpm
320/6
1977-1982
Twin
M20B20 carb I6
90 kW (121 bhp) at 6,000 rpm
160 N⋅m (118 lb⋅ft) at 4,000 rpm
320i
1975-1977
Twin
M10 (M64) injected I4
92 kW (123 bhp) at 5,700 rpm
172 N⋅m (127 lb⋅ft) at 4,350 rpm
320i (US)
1977-1979
Twin
M10B20 injected I4
81 kW (109 bhp) at 5,700 rpm
152 N⋅m (112 lb⋅ft) at 4,000 rpm
320i (US)
1980-1983
Twin
M10B18 injected I4
74 kW (99 bhp) at 5,800 rpm
135 N⋅m (100 lb⋅ft) at 4,500 rpm
323i
1978-1982
Twin
M20B23 injected I6
105 kW (141 bhp) at 5,800 rpm
190 N⋅m (140 lb⋅ft) at 4,500 rpm

Question: What models were available at the E21 level?
Answer: At the E21 level, three models were available: 316, 318 and 320.