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06-10-2007 05:25 AM #1
I think what you actually have going on there is what is called electrolysis or galvanic corrosion. It occurs when you submerse metals into a liquid, and usually the less noble metal gets eaten up. This is exactly what you have in boats that stay in the water, where underwater parts begin to get eroded away. That is why boats use sacrificial zincs, because the zinc will take the hit rather than the shafts, rudders, etc.
You might even have some stray electrical currents accelerating the process. This might sound strange, but I think they sell zincs for cooling systems to protect parts like aluminum.
Don
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06-10-2007 05:48 AM #2
I wonder too if the bib is one of those marvelous POS wonders Made in China?
Some of the guys who bought chrome plated timing covers made in China found they couldn't seal off oil leaks from the pan/timing cover juncture because the timing cover was the wrong size in that area.
I'd be inclined to buy a GM replacement part - hoping that it was US or Canadian made - and shoot it with some Dupli-Color gloss black engine paint.
Shiny stuff is nice, but if it doesn't cut it....C9






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