It has been a while ago that I installed a PDR cam in my 01 truck. Finally I got to do a MT pass trip with a real load. Had my 12,000# pulling tractor on the tandem dual trailer. Gross wt about 26,000#. Went over Stephens pass (in Washington state) There were only a couple of spots that the pyro topped 1200Oo. Way better than before. Used to be easy to push past 1375+ before. Now I did port the head and install a ATS manifold at the same time. But the end result is very good.