IT SOUNDS LIKE YOUR OCD IS IN FULL SONG ! I WOULD NOT BE SURPRIZED THAT BSA WOULD BUILD A FEW 66 CLUBMANS TO USE UP LEFT OVER PARTS FROM 65.IF THERE WERE NO 66 CLUBMANS WHY WOULD ALL THE FACTORY NUMBERS DATA LIST THEM?? THAT BEING SAID I AM CONVINCED THAT MY MOTOR IS MOST LIKELY A 69? I BOUGHT IT FOR PARTS SO I AM NOT TOO DISSAPOINTED??
First of all TURN OFF THE CAPS !!!!!!!!!
1) it makes it very hard to read your posts
2) it is considered as shouting ie rude .
Second there is primary sources of BSA numbers , those made by BSA themselves.
You will find these in the BSA factory Despatch books and also in some BSA parts books.
Both of which have been found to have errors or unexplained inconsistencies if you like.
Thes are the only numbers you believe.
After that you have secondary sources.
Secondary sources are period publications like dealers trade in books , magazine articles and extracts from the factory records by third parties.
These should be considered as probably correct allowing for transcription errors and errors in factory data.
Then we get to tertiary sources , things like appendicies in Bacons abominations fall into this category . dubious accuracy.
Finally there is everything you see posted on the web, much of which is lifted from things like Bacon's books and posted by people who have done absolutely nothing to validate the material and include it to make themselves look authoritative
They should be considered as the roughest possible guide to what might by sheer accident be almost correct , some of the time.
Then there is the repost or reposts of reposts.
So the long & short of it.
Unless a list o the web credits its source don't believe a singel pixel is right.