On Jun 15, 8:28 am, "Gig 601XL Builder" wrDOTgiaconaATsuddenlink.net
wrote:
Dave S wrote:
Gig 601XL Builder wrote:
Are standard car sparkplugs 12mm.

Asking so it get the right kind of CHT probes.


Cars may have 10, 12, 14 or 18mm. Very old cars may have US threads.