Hi gentlemen

Yes, the EFI ball bearing is the way to go. It has the needed heat resistance sealings and is a bearing with a slightly larger tolerance between inner and outer ring. So is the normal sparepart ball bearing. It is easy to feel when the bearing is new because it spins very easy. In bearings language this is called c3 quality and they are rare, compared to the normal bearings, i.e the price is higher ! Anything that runs many rpms in hot places should have these bearings, so installing standard ball bearings is not good especially not in a fine engine.