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Thread size
Posted by: corvairsince70 ()
Date: June 29, 2020 03:17PM

Anyone know the thread size of a standard ?" spark plug? I have a bad hole and need to clean it up.

Nashville area

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Re: Thread size
Posted by: MattNall ()
Date: June 29, 2020 03:30PM

14mm Sparkplug thread chasers at your FLAPS

Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!

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Re: Thread size
Posted by: Vairismo ()
Date: June 29, 2020 04:07PM

14mm X 1.25 is the size. Not sure that info by itself is of much use though. Hope the plug chaser tool works for you

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Re: Thread size
Posted by: vairmech ()
Date: June 29, 2020 04:31PM

And to be more correct it is 14mmx1.25x 7/16" long.

Ken Hand
Handy Car Care
248 613 8586

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Re: Thread size
Posted by: viewmaster ()
Date: June 30, 2020 07:13AM

In a pinch, to clean up threads, you could take an old sparkplug and cut 2 or three grooves in the threads, perpendicular to the threads, with a thin cutoff wheel, and clean off the burrs, and use that to chase the threads in the head. Make sure the grooves and threads are very clean of any burrs.


'65 '500' Sedan 110 PG
'65 Monza Sedan turbo'd 110 SU conversion
Fresno, CA

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