Depends on how you want to define this. Most of the 60s Ferrari
V-12s were the same design, if not the same specs, as the V-12 race
engines of one or two years before. (If you were a friend of Enzo, you
could get a race engine in your street car, period. Lots of street cars
ended up with the race cams but lowered compression.) Except for the
"big bore" engines designed by Lampredi, *all* the street V-12s trace
their design roots back to the original Columbo V-12 design for Formula
1 in the early 50s ... from the original 1.5L supercharged engine all
the way up through the 4.4L engines in the Queen Mother 365 GT 2+2. The
twin-cam street engines first appeared in the 275 GTB/4 in 1967,
continued on in the Daytona. This is "just" a twin-cam head on top of a
Columbo block and was first a race engine, too.
The flat-12s in the 365BB, 512BB and Testarossa are more or less the
same design as the 312B Formula 1 engine.
Someone already mentioned the Dino's V6, which design really goes back
to the 196 F1 car of almost 10 years before...
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