700 HP is easy with LS.
403 cubes -- 707 HP.
https://www.enginelabs.com/engine-te...ild-with-ffre/
https://www.youtube.com/watch?v=qdC_VYG7oAg
What if they added 60 more cubes?
Here is another.
LS 7 454 820 HP pump gas naturally ASP / solid roller cam. @ 48 seconds into the video.
https://www.youtube.com/watch?v=tUGGGnjjGXo
Many applications when the client wants north of 600 HP they move to forced induction anyway.