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Funny your mention about the cams, David. I worked a lot on an engine, Lycoming TIO-541 (6 cylinder with turbocharger) which had all sorts of cam and lifter problems. Turns out the lifters were made of an inferior metal or processing of the metal. Anyway, I saw many cams rejected for no perceivable reason. Turns out when they were measured, they were out of spec. Funny, but most of us working on those engines suspected they were bad from the factory.
As it happens, the cam is made by a well known cam manufacturer, which I don't remember at this point, to Lycoming specification, but apparently not a very good standard. You can get the specs from Lycoming, but not the cam manufacturer. Aircraft engine cams have a really poor profile, but Superior Aircraft Engines developed and has FAA approval of a replacement cam that is much better designed. They advertise it as making for a smoother running engine, but I believe it also creates a little more power and gives you a better fuel burn. The other thing they claim is that it puts less stress on your valve train.
Mike
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