hello welcome to the site.
can you please give me some more insight on the problem at hand ? are you getting a insufficient egr flow code ?
the passages are not blocked the egr port on the upper manifold is restricted and will cause the code to return you will need to remove the upper part of the manifold and drill out the passage and then retest. this is very common .if you remove the egr valve and plug the clean side of the 2 ports it will have vacuum and the other will be spent exhaust. if both of them are working then its not plugged at the head.