Are you the same CO S13 I know from Zilvia? How did you stumble upon TampaRacing?

Anyway, the gasket shouldn't be smaller than the ports. It's generally the other way around, and when an item is ported, it's ported to the gasket. No use, and actually bad, to port more than the gasket. What brand gaskets did you get? Do you usually have this issue with gaskets being too small?
-Jeff