Good point Muduckace,the PW series of round engines are an example of this, how many cycles are REALLY on the con rods and Cyl heads when they return tagged? In my case we are runing GITSO engines on the 400 series Cessna twins, Ram seem to do a great job, our problem is with the accesories, we just installed our second alternator on the right side, will see how this one goes, Regards, Clunck.