Quote:
Originally Posted by LGAFF
If you have the smaller diameter(alittle over an inch) breather holes, O'Reilly and most other stores stock Dorman 555-018.....it is a hair small, however using a 17mm socket you can expand it to a perfect fit by driving the socket into the plug
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Most of you young whipper-snappers were still squirmin around in chitty diapers when all GM SBC freeze plugs were just a flat disc - just slightly dished. The idea was/is the dished plug fits easily in the hole and would bottom against a little lip that was machined into the hole. The convex side of the plug faced out, and when driven in - thus flattening the disk - the edges expand to tightly seal the hole.
As far as this discussion goes, if there is such a lip in the 90 IH holes, then I'm wondering if the convex Dorman (sp?) plugs might not be thus installed w/o trying to flatten them to fit before installing them?
I'm just axin'...
P.