Wich type of cylinder head makes the most power?

Quenched hemispherical DOHC. The combustion chamber shape isn't nearly as important as how the air gets in an out of the cylinder. Having canted valve angles allows the valve to open away from the cylinder wall, unshrouding it.

for what fucking car????
op... are you
>r e t a r d e d

>no imperfections
>covered with piss

sounds like Germany