What caused this erosion

imidazol97

Top Dog
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Friend has 99 and found this when he took the LIM off. It's a dead end against the coolant passage in the head between #2 and #4 as seen in the 2nd photo with some erosion into the iron head.

Is this due to the exhaust gasses getting to the coolant from the openings in the head?




 

redmondjp

Full Member
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Buick Ownership
Buick
This is why you are supposed to regularly change the coolant. Over time, it becomes corrosive.
 
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