That one, I've got no idea 
You'd have to do some digging on a truck performance site... performancetrucks.net will probably be able to tell ya.
Heck, for all I know your current heads might out flow the vortecs
But it would be nice to know for sure, right?

You'd have to do some digging on a truck performance site... performancetrucks.net will probably be able to tell ya.
Heck, for all I know your current heads might out flow the vortecs

But it would be nice to know for sure, right?