Since I have not bought a engine, I am still open to suggestions. I see that the 2016 Pentastar engine is a pretty good candidate: All aluminum 60deg V6 (no balance shaft!) In 'car form' is 326lbs (I'd say less than 300 when put in 'aircraft mode') 200hp at slightly over 4000rpm (out of 290hp avail at 6800) Tuning/ECU mods is a thing multiport, not direct injection engines are fairly cheap (ebay < $1200) Downsides: Most PSRUs seem to only come with Ford/Chevy adapters new engine, might have issues I don't think this is a huge difference from the LV3 other than not having direct injection. The Pentastar would have more HP at higher RPM, but my sweet spot is 200hp at less than 4500RPM. Any thoughts? An IO-360-A1A at 180HP is 258 dry (according to wiki) so to see a car engine at 200hp for about 350lbs installed at less than $8k is interesting.