Ok Randy, lets look at it this way. There are MANY 7?s flying around with more HP than you are contemplating. Fire breathing IO 360?s abound, and some are turbo charged. The larger displacement of your 390 IMHO, will prove a long lasting engine with great results. My only concern is that care be taken starting TO roll, so not as to over tax your rudder/feet. GO for it!N55CU said:Since there is not much difference in weight or money between an IO-360 and the new IO-390 (210 hp). Is this way too much for the plane (RV-7). Thanks for any comments!
Randy Utsey
CLT