Thanks - very trick!It goes with another one which are basically replica's of the bearings to check crankshaft end float which looks to be 0.013" at this stage, 0.002" either way should be fine.
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From what I see on the Loctite packaging, both red and blue are rated to 300 F. I do know that Permatex supplies a high temp red thread locker rated to 450 F.I always thought blue loctite was the one which needed heat to get it to release it's grip. There was an aircraft in the RAAF on which all the fasteners had been done up with blue loctite . It made things extremely difficult. I think the safe way to tighten crank or con-rod bolts is to measure the stretch when they are tensioned to the prescribed torque for their diameter. It the bolt is metallurgically weak, it is more likely to break, but excessive stretch can be an indicator.