- Joined
- Nov 20, 2004
- Messages
- 20,034
Probably not the place to post but.... it is case related.
What is this engine case, it is not a pre 72 ? but does not have the ribs around the main bearing bore like the 72 cases in SD's pictures or like an 850. ?
https://www.ebay.com.au/itm/Norton-Commando-750cc-850cc-timing-engine-case-ONLY-06-1100-NOS-original-Norton/362501556906
Early 20M3S (69-'70).
http://atlanticgreen.com/engcases.htm
Second photo down.