Mercury 2.4L 1 piece, Hemispherical Heads

[Hydro200merc]

Mercury 2.4L, 1 piece head with a hemispherical dome, 28cc combustion chamber, some damage to one chamber (See Photo).
$200 tyd .

[Krazymaan]

Is that an optical illusion or has the aluminum started rotting away on the cylinder with the damage? down at the bottom right behind where the head gasket would seal to the cylinder.

[Hydro200merc]

Just minor surface corrosion, should not be an issue.