Keeping within stock rev limits will go a long way towards keeping it all reliable.
Javed from 034 motorsport ran a 10valver -unopened engine btw, for two years in race trim at outputs of 500bhp ish before he lost a valve head which destroyed the motor.
20valvers got more potential for sure so i dont see 400bhp being beyond std components if detonation is avoided and fuelling and coolngs kept under control.
I certainly hope to see 400 bhp and then some on the 20 vt i have...
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