Whats that noise coming from my 318?

67Dart273 said
A good mechanic should be able to identify which ones are ticking.

Wrong ,

at that very moment maybe, but anytime in the future another one could go

Lifters are cheap enough, a lot cheaper than paying labor rates a mechanic charges.

And then there is the whole having to remove the intake and valve covers again and the cost of gaskets.

If it is determined one lifter needs to be replaced the smart thing to do is replace them all

A good mechanic would tell you that