This is my as true to real life as possible Lamborghini 5.2 V10 making 632-634 HP @ 8000 rpm (varies between dyno run...

Not based on any real engine, but uses Ferrari firing order.

This is two inline 5 cylinder engines with a single shared crank, phased 360 degrees (plus V angle) from each other.

Even-firing v6 that I created as an example. Updated for v0.1.9