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RalphM · 02-29-2016, 11:11 PM

Another possibility is tapping the hole, closest NPT without going to big. Seal the plug with a quality sealer, then machine or file it down so pan gasket seals.
I've done this before on motor that's still running strong.

02-29-2016, 11:11 PM	#3
RalphM Senior Member Join Date: Nov 2015 Location: North Pole, Alaska Posts: 2,685	Re: welch plug 21 stud engine. Another possibility is tapping the hole, closest NPT without going to big. Seal the plug with a quality sealer, then machine or file it down so pan gasket seals. I've done this before on motor that's still running strong.