hb,hp and kraft engines are now made in the usa.I have bben a fox and k&b fan since my controline days.Ido admit to owning some os and webra and supertigre engines but since fox came out with the mark x carb i use them on my twins and multi engine planes.the os engines i have seen lately do not impress me like the old fsr series.and super tigre is now made in china.I hat that term used around here keep in box for k&b.when i was running ducted fans the k& b 3.5 and 7.5 were the engines to use.just use a nylon beasring retainer bearing and no problems.had my 3.5 turning 24,500 rpm on 10 % nitro as it had a .40 size carb a rpm rod and a robart mark 4 pump never a lick of problem