It's due to having two dissimilar metals in an electrolytic solution. It's Galvanic corrosion. Basically a non issue on LS motors since they are aluminum sleeved blocks.
This result in having to conduct a lot more maintenance.
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2007 C6 z51 416ci, KW variant III, Wilwood WS6, Traqmate.
2005 F-350 PSD 4x4 DRW Lariat
2013 Mustang GT Grabber Blue, track pack, Brembo, Recaro, 3.73s
2009 Jetta Auto 2.5 liter
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