![]() ![]() All of the castings in these engines are poured in US foundries and are based on all-new CAD designs cast from C355 aluminum: a common US military alloy known for its stability over multiple heat cycles. They are the most powerful EVO configuration of these sizes. ![]() ![]() True to their name, the 4" bore 107 inch El Bruto engines have horsepower to spare. Ultima is now offering the new "El Bruto" series engines, made in America for your Harley. Ultima El Bruto 107ci Evolution-Style Engine for Harley-Davidson Natural Finish
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