That's not a tick, thats a knock.
Early HEMI's made that sound and it was normal however it wasn't the engine, it was the front pump on the trans. This sounds similar but much louder than the front trans pump and I've never heard a ZF make that sound.
I hope I'm wrong but that sounds like a rod. How's the oil pressure and have you cut open an oil filter?
Open the hood and listen, try and see if its coming from the bottom or the top of the engine, if its the top, it could be a collapsed lifter and the sound you hear is a rocker arm hammering on tearing up a valve tip.
The speed or frequency of the sound suggests the bottom end, noise is fast (crank spins 2x's as fast as the cam and valve train knocks will be slower), that sounds like it knocks every crank rotation