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Just leave it as it is until something more urgent is required like a valve job

Just put some Wilwoods on there and have done with it :D

If you are considering Airspeed UK for an engine might be worth checking out the buyer seller feed back on VZi HERE

I think you just got a junk bearing as it'd only be going 3000rpm at idle From what I remember 18000 rpm is the limit for that kind of bearing

The other thing that will be problem with any aluminium top pulleys is they chew up on keyway

The bit about standard Vee belts slipping at high rpm is not strictly true Yes they do slip but then they melt and break and fly off so not really a safety mechanism. The problem with serpentine systems is the bearing spins beyond it's design limits when it has a side load imposed on it so best...