Well, it looks like NCEES will require some exam topics to be in USCS *and* SI units effective October 2008. See the "NOTES" section of the BREADTH, HVAC Depth and Mechanical Systems/Materials Depth aka Machine Design. The unit requirements for the Thermal/Fluids Depth seem to be unchanged circa 2001.
See http://www.ncees.org/exams/professional/pe...nical_exams.php
See http://www.ncees.org/exams/professional/pe...nical_exams.php