What engine is in the Honda NSX?

The NA1 NSX (1990-1997) has the C30A 3.0L DOHC V6 making 270 HP in USDM spec. The NA2 NSX (1997-2005) has the C32B 3.2L V6 making 290 HP. Both use VTEC, titanium connecting rods, and all-aluminum construction. They're among the most refined naturally-aspirated Honda engines ever built.