The progress in that era would make new models obsolete when they were produced! Dialog with you is always engaging, I also agree, I bet it was more reliable. For an engine that was not commercially accepted, and considered a "commercial failure", 18,697 of those the R4360 "Wasp Majors" were built. With a T.B.O. of 600 hrs. on these engines, it is east to see why they are considered high maintenance. Reading the "Wiki" on this, it is mentioned that all 56 Spark Plugs could be easily fouled! I get bummed when my Suzuki fouls one spark plug. I imagine a C.D.I. ignition would have help with. that I always wondered why they never considered developing hydraulic lifters on these engines. Of course, I am not an engineer, so maybe there's a good reason.