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Jim Brierley · 03-21-2013, 10:35 AM

What you heard is an old wives tale. They may be poured upside down but that would only be to insure that all areas are filled. This is determined by the gates and vents more than which side is up. There isn't time for any particles to "settle", the iron (or aluminum) sets to quickly for that.

03-21-2013, 10:35 AM	#5
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,251	Re: Casting the block upside down? What you heard is an old wives tale. They may be poured upside down but that would only be to insure that all areas are filled. This is determined by the gates and vents more than which side is up. There isn't time for any particles to "settle", the iron (or aluminum) sets to quickly for that.