crankcase threads

[Ralphy2]

Hi, I have looked in books I have but i cannot seem to find what the thread form is for the bolt holes that hold  the inner timing cover on a '67 A65, is it 1/4" BSF or !/4" CEI, I know they are both 26tpi but the angles are different, my question is which one did BSA use?

thanks, Ralphy

[limeyrob]

The BSA club fastener list has it as 1/4 CEI if its 68-0216.