Guys I have an issue that most people don?t, my CHT?s run very cool this has been going on for many years and for the most part I?ve been pretty proud that I didn?t have an issue of high CHT?s. About two years ago I had a sticky valve I had taken care of it and the plane has been flying fine. When I was out at Oshkosh this year I met with Superior Engines and spoke with them for quite a while I told them of my issue with my low temps and their concern was that?s why I?m having a sticky valve as most of my temperatures never get above 300? in Normal straight level flight. Typical temperatures range from about 265? to about 295? cylinders 1 through 4, running 25 square at 4000 feet lean of peak at 78? outside temperature. So my question is what should I do, do, I close up the intake or do I close off the exit part of the cowling. Just a few bits of information this is an RV-8 with an I/O 360 fuel injected with a standard cowl the only thing that is different is I have an exhaust system that is 4 into 1.