Im not going try to assume to absolutely know what that noise is. But OP what you need to do is find out for yourself. Heres what you should do, get a stethoscope with a hollow needle attachment..or you could get one at your local parts store like this one.
http://tradetools.co.nz/products/3037020
The reason why im telling you to do this is because that noise could be MANY things or a combination of things. But to pin-point where that noise is coming from you should precision listen instead of diagnosing the sound on general knowledge and make a hypothesis based on assumptions.
Lifters, valves, tensioners, injectors, direct injectors, pullies, etc.. can all make similar sounds at all different unorthodox patterns.
while the tick will always be audible in your search using the stethoscope, there will be one spot where that tick will be the loudest. Note it and get back to us.