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Replaced the O-470 in our 1968 Skylane with TX Skyways O-520-U/TS (derated to 280hp by a red dot on the MP) plus three-blade Scimitar prop and beefier engine mount. Improvements are immense: smoother, quieter, 1200+ fpm climb at 100kts, 150 KTAS cruise, 15gph at 10,000, 250ft short-field t/o...