However, most sports car racing these days use inlet restrictors which will tend to limit the tuning potential of the flat plane crank. Overall, a flat plane is probably the way to go. A crossplane V8 has good balance and the vibrations are much smaller, which may give it an advantage in long distance sports car racing. As explained in the link, a flat plane V8 has significant secondary inbalance ( like a 4 cylinder ) which cause the engine to vibrate which can start shaking the car to pieces. The exhaust tuning potential also gives it a slight edge in turbocharged form as well. The even firing of a flat plane gives much better exhaust tuning and is the only real configuration if you are after an ultra high performance / high rpm naturally aspirated race engine. The odd firing produces the characteristic 'V8' noise whilst a flat plane sounds like a 4 cylinder.
The crossplane V8 has uneven firing on each bank whilst a flat plane V8 has even firing pulses.
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