A normal ticking is the fuel injectors opening and closing, a very loud ticking with bad mileage and poor performance may be a sticky lifter, aka hydraulic valve lash adjuster. If the latter try something like Marvel's Mystery Oil or another sticky lifter nostrum before launching into a difficuly and expensive replacement.
The fuel injectors make the ticking noise you hear at startup, especially when the engine is cold (colder temperatures).
the ticking noise is a small exhaust leak close to the exhaust headers or exhaust pipe near the engine.
lifters
if ticking noise is in engine, u most likely have a worn hydraulic lifter. check oil for correct volume and viscocity
from which part of your engine is the ticking noise coming from. if is the TOP it would most likely be lifter noise.try using a thicker oil.
Try to locate the ticking noise. Is it the engine? Is it ticking when you are driving? When you are sitting still? It could be as simple as a stone stuck in yoru tire, everytime it hits the road it ticks. it could be a lifter in the engine. Try to be more specific as to where and when the ticking happens.
It could be that hydraulic lash-adjusters may be clogged up.
your battery is dead
Ticking is not that that big of a deal to require a new engine. If your engine is knocking, it is a big deal. Make sure your car is ticking first. Ticking is usually caused by the valvetrain of the engine when it is not properly lubricated. As the engine increases oil pressure the oil makes its way into the valvetrain and the sound should go away. If it goes away when the engine is warm, it's likely ticking. If it is ticking, it sounds like you might be low on oil. Add a half quart see if it goes away. Then check your dipstick to make sure your are in the "safe zone." On some cars, you need to go above the "full" mark (ONLY A LITTLE, at most 1 quart over, which is about the same as the distance from full to low marks on the dipstick). It may need more oil, but use judgment from there. Hope that helped. I do not think it is a big deal, if your engine makes ticking noise. I drive my subaru seit 7 years with such kind of noise and never had any problems.. Do not replace engine for such small thing, most likely is your hyd.lifter a bit noisy. So what :)) Good luck.
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.
98 Chevy new 383 block 30k, ticking noise from sounds like heads . 210k on heads;
Possible lifters that are bad that could explain your ticking noise. It should cost you nothing by stopping by an Auto repair shop and have them listen to your engine.