Not to be the bearer of bad news, but most of these inline intakes were never meant to be water heated because of this type of porosity issues. Offenhauser is another one that has a disclaimer against this method of heating. They were originally meant to be exhaust heated. There have been countless people that have been fine using water to heat theirs with no problems, but they can be counted as lucky since they weren't originally intended to be used that way.
