Indy/rhs heads?

I just cc'd the factory iron magnum head and the intake runner cc'd at 154 cc's. 25 cc's smaller than the Indy/RHS head in as cast form, this is a bunch. For a comparison this is the difference between the 318 and the 360 heads. The 318's having 120-122 and the 360's having 150-153 cc's.