Turns out we’re not all forgetting it at all and the same engine was already mentioned 3 times previously, who knew... Everyone but me apparently.
My #2 vote goes to the Mclaren M8C and all it’s euro-american unequal inlet trumpetty goodness (I know, it’s also mentioned before, thank you for keeping rigorous notes).

I think we’re all forgetting a crucial entrant.

Small capacity, 2-stroke V8. It has the vile rattle of the devil’s teeth and the expansion chambers look like his claws curling over the top to rip it apart too.