I need feedback on a mechanical issue I'm having. In the last 2 weeks, I've started to hear clicking coming from the engine compartment. Only happens when I start up. It lasts a few minutes. Clicking speeds up when I Rev the engine. Thinking it might be a pully but I need other opinions before I do anything.

 

Exhaust manifold.

 

loose or need replaced?

 

Broken bolt(s), cracked, etc.

 

the back two cylinders on the 5.7 hemi run real hot. Hotter than the rest so they sometimes cause the expansion/contraction to exceed the bolts strength thus they snap.