===========================Aircraft need continuously rated engines. Hopped up engine power figures are rarely tested for even 1 minute. Race aircraft have had numerous hopped up engines. The TBO reliably suffers attrociously. A 440 is based on a 13ish HP engine. More than doubling the thermal load needs more than a few stronger parts, or something will give.
A Stock 440 is 18hp! These different Honda/Clones Engines are being used around the World on Real Aircraft with 5000-5500rpm takeoff, so your Arm Chair Mechanic baseless assumptions are wrong. What kind of TBO do you expect from a $350 Engine with $400 in Upgrades? These Type of Honda/Clone Engines used on Industrial Mowers see well over a 1000 hrs. Learn How to Build One for Racing/Airplane use & Maintain it.