A billet block is a pretty serious ordeal.. if you purchased one, you would be doing all the testing too - so you might find a host of unpleasant surprises along the way. Most the GT-Rs do a wet sleeve setup. The VR block is more robust than a VHR from the factory, but once they have both been hogged out for wet sleeves, you probably end up with a pretty similar result. Even those wet sleeved VR blocks dont last forever though. I know that most of the 1500+ hp GT-Rs will destroy their engine each event, which is why they bring spare engines or only do 1 or 2 passes before loading back up.
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