Excerpts
from Countachinfo.com
In
1985, Lamborghini made the biggest improvement to
Countach. The V12 was stroked to 5,167 c.c., incorporated
a 4-valve cylinder head (called
"Quattro-valvole" in Italian, which gave
its name "QV") thus a total of 48
valves. Power jumped to a world-beating 455 hp, torque
rose to 369 lbft.
Finally, the Countach produced more power than the
originally proposed LP500 prototype, which would have
been capable of 440 hp from 5 litres of displacement.
Forget the 200 mph dream, this would never be achieved
with the same aerodynamic. As the body was virtually
unchanged from LP500S, people were happy to see the
QV could run up to slightly over 180 mph, which was
among the fastest in the world. Ferrari 288GTO and
Testarossa had more or less the same top speed while
other competitors were quite far below.
