Not Mopar powered

I worked on Jacobs 7 cylinder radials when i was in aircraft maintenance mechanic school back in 1990. Neat engines. Top cylinder is always the last removed on disassembly, and first installed on reassembly. Its the one with the "master rod" its cool to actually see one working instead of as a school teaching tool. Had one on a run stand, and always have to run the props through by hand mags off checking for liquid lock before firing it up. If that happened, had to remove the spark plugs on the lower 2 cylinders to drain the oil out before trying to start, otherwise you would blow the lower cylinder heads right off the damned thing. Its a dry sump system, theres supposed to be a check valve on the way to the oil tank. Sometimes it leaks back. We also had a jacobs engine in powerplant 1 class that was a cutaway engine with 1/4 of the cylinder cut away and the rocker boxes removed so the teacher could show the otto cycle in real time by rotating the crank with a turning bar. Cool stuff. Like most old skool mechanical stuff out there i like it, i like it a lot.