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The local guy that did the porting on my heads for my Fairlane said he preferred to keep the ports smaller to increase velocity rather than making them as big as possible.
You never asked.
please explain
Smart man.
You don't really want to know. ...........
and i wasn't trying to make the ports bigger just smooth all the sharp leadges in them and there were a lot of those! i wish i could get a clear pic of the stock ports it would amaze everyone it looks like a set of steps in there litterally.
Without knowing exactly what you are describing,those may have been a design feature to actually enhance flow or to influence swirl and tumble.
The point is,in all reality,for most all uses,starting with a decent head and doing a port match and lightly massaging the first inch under the valve along with a good 5 angle grind will give the best results.