Ticking sound while engine running

I agree with 273....I had a 69 Dart with headers....there was a small exhaust leak and it would sound like a lifter....bought a new set of gaskets and viola...tick went away....and yes mine was intermittent ...basically got noisier the warmer the car got...
Hate to say it...good sound but too dark to see anything in that vid....so could not tell if headers or stock....but even at that a stock exhaust can leak too...