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ron10 · 04-05-2011, 08:49 AM

think it is expansion and contraction of metal being heated and then cooling.

04-05-2011, 08:49 AM	#14
ron10 Drives: 2010 2SS IOM L99 Join Date: Jan 2010 Location: LOUISVILLE,KY.. Posts: 7,545	think it is expansion and contraction of metal being heated and then cooling.