If the crank assembly is able to be turned freely by hand and you don't feel any significant drag it should be fine. Just a quick question. After the new build, did you re-torque the head after the first 20 minutes of letting the engine run at different RPM's? If not, this might be why you blew a head gasket. I would clean up the carbon deposits on the valve and the head also.
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DWayne
1973: 128, ag tires, 3pt. lift, spring assist, lights, 42" Deck
10" moldboard plow
2016 XT1 42" deck 18HP
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