[PeteKz]

Henry, no I'm not playing a game. There's no "gotcha" here. The reason I keep asking is because what you have said before about replacing bearings does not make engineering sense to me.

Once again you have not answered a very specific question: At what point do you think the bearings should be replaced? When they exceed specifications or show damage? Any time the case is split, even if it was only run on a dyno? 10Kmi? 50Kmi? 100Kmi? Based on what criteria?

Last, I am not questioning your experience. If you say use certain sealants because they work best, and you have tested them, then I buy those sealants. If you say the best way to assemble an engine is XYZ, then I do it that way, no questions. If you say that a certain configuration of engine with a certain cam will produce X horsepower, I don't doubt that. You can't derive those lessons from engineering principles. But if you say that bearings should be replaced every time you split the case, regardless of wear, then yes, I will question why.

One other thing: You said that I advised kamaro not to split his case. Not correct. Read what I wrote. He already split his case when he started this thread. And he went to the trouble to measure his old bearing clearances, and they were within new specs. I agree with brighton911 that I would put the original bearings back in.