B20F-kannessa seetit tehtaalta. Todella harvinainen kansi.
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B20E: 10.5:1 compression. Bosch D-Jetronic electronic fuel injection up to 1973 then K-Jetronic mechanical fuel injection from 1974 on. 130 bhp (96.9 kW) for 1970 and 1971 and 135 bhp (100.7 kW) from 1972. First produced in 1970.
B20F: 8.7:1 compression. D-Jetronic fuel injection up to 1973 then K-Jetronic fuel injection from 1974 on. 118 bhp (88.0 kW). First produced in 1972 for lower emissions.
The B20E and B20F versions featured larger valves, and intake/exhaust ports and for 1974-1975 switched from electronic D-Jetronic to mechanical K-Jetronic injection