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Sunnybrook Farm · 05-30-2021, 04:21 PM

I have an engine that has a spark plug base in the oil drain hole, it is the same size, I left it in there with no leaks. I was surprised they were the same threads.

05-30-2021, 04:21 PM	#16
Sunnybrook Farm Senior Member Join Date: Oct 2015 Location: Virginia Posts: 409	Re: Thread size for a Model A spark plug I have an engine that has a spark plug base in the oil drain hole, it is the same size, I left it in there with no leaks. I was surprised they were the same threads.