I would think that before we start changing engines and tearing motors apart the noise should be properly diagnosed. Some guys hear a noise and all of a sudden they have "THE TICK". there are so many moving parts in these motor / cars. It could be anything, valve lash adjusters, cvalves, timing chains, tensioners, bell housing componetns etc.etc.etc. These "noises" need to be diagnosed not just assumed what they are. I hope it works out for you OP.