???? The t'stat is indeed a restriction. It helps to build pressure in the heads in particular and also in the block to some degree. That helps lessen the tendency for the coolant to locally boil in the heads. Guys who take out the t'stat and find hotter temps think it is due to too fast a flow (which would not make it hotter anyway), but it is due to the lower pressure inside the heads.
Block wear accelerates considerably with cold temps. This is a known thing, particularly in inline 6's where it is common to have bore wear in the coller #1 cylinder. It may makes sense to run with no-stat in a true race-only engine but not on the street, IMHO.
Thanks for the link DuBob. I had read that many moons ago when researching Evans. I took it with a big grain of salt due to it being a competitor.......
Sgaugian, that is interesting. Does it run cooler at the temp sensor or at the rad? I strongly suspect that if it is cooler at the temp sensor, then that is from cleaning out the system properly! All of the science behind Evans says things will run hotter, all else being equal.