One observation I can make is IF my car sits for a while, say a week or so, it ticks loudly at startup. Once I get the engine good and warm, or hot, a few days in a row it no longer makes noise at startup. I'm not advising anyone to drive the **** out of their car like I do, but I'd try a bit of fun, or abuse if you prefer, before replacing parts or engines and see for myself. If not driven regularly, these cars tick or tap.

Les