[A//// Guy]

If it just happened out of nowhere, your either low on oil or maybe its something else like timing. Usually lifter tick doesnt just start out of no where, it slowly gets louder and takes longer for it to quick down once the oil gets warmer.

If timing skipped a tooth or two, you will hear an audible knock which is pistons/valves hitting... Just double check the timing if the ticking just happened out of no where.