No, we have never built a turbo engine ourselves using these bearings. We
have sold lots of these to many different customers, trade and retail and
have not had anybody come back to us with a problem. As with all motorsport
components, there is no guarantee. If you want to use a heavy duty bearing
then these are the only ones available. As we said when you called in, we do
not supply anything else and you can always have the oil hole drilled if you
are unsure.

Regards
Dick