According to my auto teacher the plugs are their for the casting process. If the water in the block was freezing, the water/ice would be pushing out in all directions and usually the block cracks before the plugs do anything. He could be wrong tho, but i can see his point.
Are our plugs...
I don't know why but i thought this was pretty interesting. I never knew of these things.
Link to more pics
http://www.groonk.net/blog/mt-archives/005839.php (CLICK ON THE PIC TO GET MORE PICS)
http://www.picturesofcascade.com/picturesoflakes.php/?idnum=70&mode=1
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