The BSA Workshop > Twins

A65 Cylinder head

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Mike Farmer:
Hi Julian 8)

At the risk of boring everyone else rigid I still don't know which cylinder head I've got. The casting no does not appear to be recognised by any of the "dealers". So what alterations were made and when. All I know is that at some stage the Valves were changed. That infers that the seats were also changed.

Do you reckon that I can check this out simply by measuring the seat diameter or what else might you suggest.

What were the valve changes and was the head casting actually changed in any way.

Your help and advice appreciated.


The service bulletins below might help.

Could you post photos?

Mike Farmer:
I  :)am about to try to post some pics. Anything is likely

Mike Farmer:
Try agen

Mike Farmer:
This is the third attempt. If I still have it wrong ????????????????


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