Quote:
Originally Posted by Leonardo629
I thought it's only lead....copper can still be found in UOAs...
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What has been observed is the original 088/089 bearings are a copper/lead content while the 702/703 bearings are of an aluminized tin/silicon compound.
Complete discussion of bearing history and compounds of each can be found here:
http://www.m3post.com/forums/showpos...71&postcount=7