Well strictly speaking I've done it twice, don't know the full extent of the damage in the engine that's currently in the car, but the one we took the heads off of the bearing had completely worn away and the piston could come a few mm out of the top of the bore. In my case the crank will probably be scrap because of scoring etc (don't get them machined, I've seen what can happen there). However in your case it should all be fine and it'll be a case of swapping the bearings- think of it as prevention rather than cure.
A cracked head will only be apparent on getting them checked, which you'll need to have done anyway.
Luckily, if you need new heads, there's always idiots like me around knackering their big ends.
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