Indy Cylinder moves into the future

At the end of the video, did you notice that 6 cyl on the stand????
Was that a slant 6 on a eng stand setting up right????? if it is a slant 6, it has cross flow heads and a canted valve arrangement.
This would be WAY COOOL.......... but must be something else.......unless, there is some new hot rod class, that i don't know about, for them things.
Don't think i will ever have the coin to drop into there bank but........
Thanks for the video.

My guess is diesel.