I tried the smallest prop it calls for and the engines are a few years old so im sure there broken in. the tanks are level with the carb and i have a standard fuel line that i run several twins including a enya 240 twin with no problems. I got these three engines over the winter and just tried running them over the last few weeks. They have good compression, the valves are gapped at .005 to .010 and i have one engine in a jungmeister bipe, a p47 and another in a 60 size trainer.

Dave