  Magnesium bell housing. 
This is a great chunk of magnesium.  From the breathless eBay listing:UP FOR AUCTION WE HAVE A TILTON MAGNESIUM BELL HOUSING W/ TRANSMISSION MOUNT / ADAPTER - RAN CHEVY - HOUSING DOES HAVE MINOR CRACK.  SET COMES FROM MAJOR NASCAR TEAM AND IS RACE PROVEN-  AND READY TO GO!! I wasn't sure this was real magnesium, but since it was cracked already, I broke off a small piece and tried to light it. I was just about to give up and conclude that it was actually aluminum, but I know how hard magnesium can be to light sometimes. Sure enough, after about 30 seconds with a propane torch, the little bit caught and burned very brightly for longer than you might expect. No question about it, this is solid magnesium (though probably with a few percent of alloying elements). 
Source: eBay seller raceprovenparts 
Contributor: Theodore Gray 
Acquired: 2 April, 2009 
Text Updated: 8 April, 2009 
Price: $75 
Size: 14" 
Purity: >90%
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