Re: Can't get freeze plug fitted

[Bullwinkle <yd3@nvc.net>]

Yes, the "Freeze Plugs" holes original purpose was to provide
webs to hold the inner sand cores in place.  I suppose they got
to be called "freeze plugs" when they sometimes would pop out
when the coolant froze in those pre ethelyn glycol days.  Older
blocks had thinker walls, so mayber they were strong enough to
resist cracking until the plugs popped out.