ELIMINATE your head gasket!

Yeah- the accepted school of thought is that you want the intake tract "rough" on a near-microscopic level. A slight bit of turbulence in the charge helps mix it better, and the flow will "drag" on a super-polished surface.

Having the port too large will cost you velocity too- so I was careful not to enlarge it, just smooth out the restrictions.

Makes sense, and the Venturi effect of the actual intake port on the head does to, just as a carburetor uses Venturi to increase airflow speed so does this. It doesn't change the actual intake manifold so say you wanted to try it on you vehicle... You'd have to get new heads (probably valve train and such) not the intake manifold, and Doc, I was going to port/polish my intake manifold on the Deere tell me how it turns out for you

Oh, I will definitely keep this updated.