Some years back, and particularly with many cars, the situation with many engines was, yes, a moron could take a head, take its intake ports, and "making it bigger" would make more hp.
Yup, just eyeball that sucker, hog it out and there you go, more hp.
Those days are largely over. The factory is not designing those ports where just generally "making it bigger" is going to yield more hp.
A more sophisticated, accurate shape (perhaps not one amenable to casting or the particular machining procedures used in manufacture) may add some power, but not some guy hogging it out "by guess and by God."
You still get morons doing this. Those dumb enough to think that flow benches measure porting success are particularly dangerous, as their hogging is "proven correct" by increased numbers on the Superflow.
As would opening the ports up to tomato-can sized.
Of course in the engine you don't have a steady breeze running through the port. Not remotely the same thing at all.
There is a possibility that a moron has cost you hp here.