Quote:
Originally Posted by fftoddster
Yes I understand that and have done that. The problem is that the car sat for 30 years and the corrosion of the weeping welch plug ate away at the surrounding block area. Also ate a hole in the oil pan but I welded that up.
The area just above where the welch plug sits appeared to be in good condition, so If I figure out what size that bore that is I believe a cup style freeze plug would fit and seal nicely there.
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I would be a little concerned that the corrosion has weakened or eaten further into the pan rail, especially on the inner and outer wall margins. Without seeing it it's hard to say but doing a little "dental" work to clear out the cancer to bare metal and see what's what. If that is ok and you think it could be drilled and tapped for a threaded NPT brass plug with thread sealer and filed down as RalphM suggested would be a good choice.