1981 633 csi

I just bought a 1981 633csi in decent condition. and just about everytime I look on the internet for information on this year car I don't find any 1981 633's just 635 csi my owners papers say 1981 csi bmw.Does anyone have any knowledge about this ? Any help would be great. Thanks B.G.

http://www.bmwworld.com/repairs/e24.htm
http://www.unixnerd.demon.co.uk/bmw_home.html
http://www.sfxperformance.com/search/auto_categories.asp?search=633&type_id=2&Manufacturer=BMW
http://bimmer.roadfly.org/bmw/forums/e24/

Here are a few of the 633 links I have.. Hope this helps

I just bought a 1981 633csi in decent condition. and just about everytime I look on the internet for information on this year car I don't find any 1981 633's just 635 csi my owners papers say 1981 csi bmw.Does anyone have any knowledge about this ? Any help would be great. Thanks B.G.
Thanks slydog : I sure the info. will help since I don't know beans about BMW's Bill.G>