Ford on Tuesday said it would invest $US335 million in its Lima, Ohio, engine plant to build a new, 3.5-litre V6 engine. The all-aluminium dual-overhead-cam 24-valve 'Duratec 35' 6 engine will power future Ford, Lincoln and Mercury vehicles, including passenger cars and crossover vehicles. Annual production capacity is projected to be up to 325,000 engines a year and production will begin by the end of 2005.