[Healeys] BN1 - Burgess Air Filters Q

[Alan Seigrist]

All -

Am refitting the original H4 carbs to my BN1 and am using the old Burgess
Air Filters.

The bolt that holds the front cover on teh air filter seems to be UNF... but
strangely, I cannot seem to determine the thread for the two bolts which
mount the filters to the carbs.  These two bolts don't seem to be UNF,
but maybe BSF?  Can anyone confirm what thread these two bolts are?  I
really don't want to have to find out by cross threading them!

Thanks,

Alan

'52 A90
'53 BN1
'64 BJ8