3453cc M90 engine in 635 CSi
- Six cylinder SOHC, 30° slant installation
- Bore 93.4 mm, stroke 84 mm
- Compression ratio 9.3:1
- Bosch L-Jetronic fuel injection
- 218 bhp at 5200 rpm
- 224 lb.ft. at 4000 rpm (191 lb.ft. between 2000-5900 rpm)
- 0-62mph 7.3 seconds
- Top speed 140 mph

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