Quote:
Originally Posted by andrewwynn
How it got there? I would suspect corrosion from interaction with the coolant or oil that was leaking through the gasket. Aluminum will definitely swell when corrosion takes root.
The concern is: if you try to remove the bump will you create a pit? Is the bump basically a big flake about to peel off and leave a big hole?
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Coolant has additives to protect from corrosion. Water by itself can corrode aluminum but it is very weak agent. Oil prevents corrosion. Aluminum blocks are an alloy that are less prone to any type of corrosive agent. Regardless, corrosion deteriorates the surface, pitting the aluminum creating a low spot rather than a high spot.