I just saw this today and I did a search on the forums to make sure it wasn't pre posted and had no hits.

I found it interesting that the fuel is liquid when it goes in. Now that I think about it it makes sense injector wise.

The fuel should NOT be a liquid when it's introduced into the combustion chamber as the liquid doesn't burn correctly. The injectors should be atomizing it and I think the huge gush you see when the intake opens is exactly that. I think it's a dual-plug Hemi motor with one of the plugs taken out and a little camera put in it's place. It's a really cool video but I wish more of the exhaust stroke were shown.

I dont think that its a hemi because it appears to have 4 valves. Personally i dont think that this video is all that revealing. It looks pretty much like i had imagined it. The only difference is that the burn i s a little less dramatic that i had thought it would be.

You might be right. I didn't notice the 2nd exhaust valve but I don't see a 2nd intake. It might only be a 3valve motor.

hmm i wonder how they lit that, too

It's probably an endoscope.