7/16-20 thread for the air ports on an MGB head. I too used the bolt
method to block them but a 7/16 fine thread set screw would look much
better. It is not a common size to find in the local hardware or home
improvement store. McMaster Carr carries them though.
On Mon, 31 Dec 2001 12:15:03 -0800 "Dodd, Kelvin" <email@example.com>
> > thinking of TIG welding them shut, any thoughts?
> I think that TIG welding the ports shut is a bit of
> overkill. I use
> Allen socket plugs, available from a good supply house. Duh, I
> believe the
> thread is 9/16 fine, but don't quote me. It is a standard SAE fine
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