Hi all, Flying along today in my pa28 (o320) at 2500 feet for 10 minutes or so...I approached Saginaw bay, and decided to climb to 4500 for open water safety reasons. Since I only lean the carb above 3000, I hadn't been paying much attention to my egt gauges until I finished my climb. When I looked down at it (before leaning): holy smokes, the number 3 cylinder egt is 250+ degrees hotter than the rest! I turned around and headed for home, and it ran hotter the whole way. I tried running on each mag just to see if it changed things, but it only made it hotter (all hotter with #3 still way hotter). I've never seen this much variance, and usually it's number 1 cylinder that's slightly hotter (25-75) than my coldest EGT. I also notice it seemed to be burning more fuel on my fuel monitor... maybe 1 - 1.5 gph more. So, what am I looking at...bad exhaust valve?