Re: Engine Tick Video...any ideas?
Valve train noises that change after reving may be the hydraulic pressure differences in oil pressure.
If the pressure falls and the lifter has a DIFFERENT pressure it will make a different noise. TO test this you only need to allow the oil to be cold versus warm to see if there is a difference in your sounds, tick.....
To experiment doing the tests warm versus cold can make changes in clearence due to expansion and oil viscosity changes.
Enjoy, Woody