Rusted valve cover bolts
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As bad as those fasteners look, I can pretty much guarantee you that aftermarket / hardware store fasteners have nowhere near the corrosion resistance of the OEM fasteners. Sure you can get them for a lot less, but the lack of corrosion resistance is one reason why they're so much cheaper.
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I haven't but I will tomorrow to humor myself. I was hoping someone used aftermarket stainless fasteners or something similar. I actually used stainless bolts for my COPs when I did the plugs since mine were also rusted. I bought them from Lowes for under $10
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