At 01:34 PM 12/21/2006, you wrote: >I think rough EXTERIORS on castings increase surface area and help >with heat dissipation, so smooth may not be good there. Marc Lee Winnig ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Rough surfaces also cause turbulence in the cooling air flow which is not good. Larry Flesner
