I have been racking my brain trying to troubleshoot what is going on here. The left (drivers side) exhaust manifold on my Dauntless 225 runs way warmer than the passenger side. After only a minute or two, the drivers side will be warm enough to vaporize water, while the passenger side will only be warm to the touch. I originally thought this was due to the old (rebuilt several times) crappy Holly 500 carb we have on it. The jeep always ran poorly with it backfiring, popping, etc. I recently installed a replacement motocraft 2100 on it, and it runs considerably better; however, the drivers side exhaust manifold remains warm. I was thinking that the hot side was running lean. My next thought was that it might have something to do with pushrod adjustment (we had adjustable pushrods) that was keeping a valve open. I decided to throw a spare set of pushrods from my parts 225 in today to test that theory with no change in results. Passenger exhaust manifold cool, drivers side hot. I also considered a vacuum leak and had use a propane torch (while extinguished) to blow around the intake manifold and carb searching for any change in RPM. No results but I am considering using some starting fluid next as that is a bit more accurate. The engine has a fairy fresh rebuild and runs decently other than one exhaust manifold is really hot while the other is cold. The new carburetor cleared up the backfire popping issues that I was having. I would greatly appreciate any thoughts, steps, or ideas to figure out whats going on.