i'm new to this forum and as my signature implies, i don't drive a z but a 69 510 w/ a "euro-spec" vg30 in it. i have done much searching on various forums and can not find any published differences on the euro spec engine other than the 264/262 duration cams. does anyone know if there are other differences? Compression ratio? cyl heads? although i'm taking the previous owners word on the source of the engine i do believe that the cams are 'hotter' as it barely idles below 1100 rpm (no vac leaks, i checked) and seems a little flat below 3400rpm at which point all heck breaks loose and away it goes. any help would be appreciated.