From the registries archives:
"However, the question still remains: once an LT5 problem is diagnosed as being other than with engine management, what framework is in place to acquaint dealer service departments with the revolutionary technology of the LT5? At the press introduction of the LT5 at Riverside, California last June, that question was raised. Chevrolet said that training would commence a few months before the introduction of the ZR1 and until servicing ability is up to speed, any LT5 problem requiring the opening-up of the motor will be handled with an engine exchange. The dealer will remove the offending LT5, replace it with a known-good unit then ship the bad motor to Mercury for repairs. "
http://www.zr1netregistry.com/LT5tech.htm