By no means are all NSx engine's Blueprinted.
Blueprinting basically means that you measure each and every peice until they are within an EXTREMELY tight tolerance. For Example Revolution balances the NSX pistons to within 0.1 Grams of each other.
All the hoses, and cables and wires, and shortened to the absolute minimum length required(Reduce electrical resistance and friction loss of liquids running through hoses) and every peice is inspected and matched to exact tolerances.
And yes as MaoMao said, only the NSX-R has a Balanced and Blueprinted Engine...(as far as I know)
I think the JDM NSX-R's are *conservatively* rated at 280ps (276hp).
By the way, Brian, let Brenda know that I am still getting that Valence for her.
Its just taking a TON more time than I anticipated.