The Saturn V6 has always been a little "vocal". A little valve noise is quite common and most likely, if it's valve noise, you probably just didn't notice it before the repair. Many people become hyper-aware of sounds after the vehicle has been repaired. The Eco-Tech engine is well designed and can be expected to last a long time if properly maintained. It's economical, reliable and powerful.
However, if it's NOT valve noise, there could be some other problems.
Try to isolate the source of the sound to see which component is responsible.
you may have a bent valve
its the needle valve inside the injector opening and closing
more than likely you will find the tick tick noise is valve adjustment's especially if there has been a lack of service
Collapsed hydraulic valve lifter? Rocker arm (valves) need adjusting?
Sometimes a ticking sound is a valve lifter. The faster you go the faster the ticking will be. Make sure first it is not something stuck in a tire or something on the fan belt.
Bearing noise is usually deeper and comes from farther down in the engine. Lifter noise is more of a ticking and is up in the engine heads.
Noise valve lifters perhaps. If the problem persists, you should be taking this back to the dealership - this might fall under warranty repairs.
Lifter noise is not uncommon.
The ticking sound is coming from the valve lifters. When the oil filter is changed, air is introduced into the system, which causes air bubbles to form in the oil. This causes the valve lifters to "leak down", which is what causes the ticking sound. It can take several days for the bubbles to dissipate. It's annoying, but harmless.
The ticking noise could be worn out rocker arms under valve covers. Switch to heavier weight oil if ticking noise subsides that could be your problem. This is usually a sign of a high mileage engine. Worst case scenario would be weak oil pump not getting oil to top of heads.
If its coming from your engine, you may need a valve adjustment..
The "ticking" sound that is most common among Saturn's is caused by a slightly expanded gap in the valve spacing. It could, of course, be something else, but that seems most common. If that's what's going on, it probably isn't worth much effort to repair. Valve clatter isn't typically a problem unless it gets severe.