Displacement Up: Power? Not Really
Air conditioning and leather became standard equipment, and the U.S.-spec E24 remained unchanged until 1980. Owners still busied themselves de-smogging the engines, while the plague of cylinder-head warpage and legal wrangling awaited those who did not.
The 1977 630CSi is both the rarest and the least desirable of any U.S.-specification E24. Of the early four-speed manual cars, the 1978-79 633CSi is far more prevalent but is still rare today.
For many, the big coupe is the ultimate of Munich's driving machines
From the February, 2009 issue of European Car
By Mike Miller