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I have a C60 on the engine stand for my '48 waiting to install new .040" pistons, rods, mains and reground crank in the rebored block. My plan is do what I have done on my last three majors, and that was to use the special break-in oil that John Deere sells. It's the same stuff they fill new engines with, and you keep it in for 100 hours and then drain and go to your regular oil. I have had great success with quick break-ins using it, and no oil problems at all. This was on two gasers and a diesl 70 JD. All were re-bores, so the engine blocks were like new. I'm sure other companies sell a similar product, but JD carries it. It might not be on the rack, but they'll have it in the back. I agree that you don't want to let it set at one speed. I like to start them , run at an elevated idle so they are oiling well, then check for anything major wrong, then put a card board in front of the radiator if necessary to get the temp up to normal, then run them at varying speeds for the first two hours, then take them out for a workout on a light load, and increase the load each hour or two, until I get them humming right along. I've had great success doing this. Wish I had a dyno, though!. Frank
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