350 Chev head gasket water holes too small?
I'm replacing the head gaskets on the 350ci chev motor because one blew out and filled #6 with water when cold. I noticed the old and new gaskets both have very small upper water passage holes (1/8") but both the block and heads have much larger passages. This was particuarly alarming since the gaskets were balloned in at the restricted water holes as though water couldn't get through well enough.
Why are the gasket water holes so small? Can or should I drill the gaskets to match the block and head water passages or maybe even just a little bigger than they are? What are the possible pros and cons of such a mod to the head gaskets?