Thanks for bringing up that Fiat engine, Rick... it was a nice baby six...
In 1800cc form, it must have revved really nicely. John McCormack used to race F5000 in Australia, and when our new Formula 2 came in during that era, requiring a production head and block, no more than one camshaft (overhead or in block), he suggested destroking a Fiat 1800 would be a good way to go.
Later 2300 cars, by the way, had disc brakes. In fact, I think they had 4-wheel discs. And there was a 2300S coupe that was regarded by many as a baby Ferrari.
There was also a 2100 in between the 1800 and 2300.
But we still haven't got to my favourite inline engine...