Blown Motor, Engine Rebuild/Replacement.

Boosted Performance

Just make sure to follow the engine builders break-in procedure and use the oil they tell you to use. The oil they tell you to use will depend on those clearances on the journals, and of course the builder will know them. I would suspect it would be a heavier weight oil like 5W40 because the engines built for higher power should be "looser".

I use 0W40 M1 synthetic on my own stock block 350Z because it has shown to greatly reduce bearing ware (Blackstone oil analysis results)

There are also oils designed for engine break-ins....something to ask about unless it has already been brought up.

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