Pretty sure at first that the heads have have the engine guys name lasered into them, but can’t tell for definite now. They do look like a Trick Flow casting.
I looked again, what I saw on my small screen 1st time was at what i see now is at 51 min in. The font and being two words looked like Trick Flow to me on my small screen. But looked again and few min later on a real TV screen and clearly is not.
And he says at about same time "used junk LS rockers"
At the 50-53 min mark shows tge rockers as well.
He not pulling a fast one like other's do.
All and all it's worth the watch if you have the time. He's got a great channel.