As in smaller than standard, but not as small as the Moroso cast pulley?
What's wrong with the Moroso pulley? I run it on the street and never have any cooling issues.
Other people who have used the Moroso pulley have said they had cooling issues because of the reduced water pump speed, so I'm not 100% confident it's the way to go.
I'll do some more research based on everyone's responses above.
