Ah, here it is - Flickriver: Photoset '1911 Fiat Tipo 6' by dmentd - 1911 FIAT Tipo 6 - Fiat Tipo 6 - Wikipedia I think it is 130mm bore x 170mm stroke - the biggest of the regular road going FIATs of the era. Contrary to what it says here - 1911 Fiat Tipo 6 Images, Information and History | Conceptcarz.com - it has only four cylinders. More big early FIATs here - 2012 Pebble Beach Concours d'Elegance Gallery - 'Class K Fiat' - Supercars.net