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· Old Fogey
678 Posts
The motor you should have is a 3.3 liter. Denoted by the last 2 numbers of the model --the 33 in 733

A 320 only has a 2.0 liter motor and it wold be inadequate in a 7 series.

A motor from any BMW model ending in 33 or 35 would work The straight six 3.0 motor (30 in the model) would work but the later 3.0 v8 would not be compatible.
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