The most powerful Volvo made themselves was the 360Racing with B19ET engine and 155 horses. The 360Racing is really powerful. This engine is on the 740 turbo and even on a 740 it makes fury. No, 740 has b230et=183 hp and b230ft 87-89= 155hp and 90-98(940)=165hp. volvo 760 83-84 has b23et= 177hp

build a b23at enigine with two modified Dellorto 45 DHLA(for turbocharging) and pistones from a b23et engine. modified Intercooler. Take original turbo from a 740 or 940 or trim60. and boost 1bar.