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Old 08-22-2020, 03:09 PM   #17
truckster
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Join Date: Jan 2001
Location: Orem, Utah
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Re: Spark plug heat shields - worth doing?

What size thread is that boss supposed to be? I can't find anything that fits, but it could just be because of paint. I thought I'd chase the threads with my 1/4-20 tap, but since you're all here, I thought I'd ask first.
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