What could this tapping noise be? Lifter, flexplate, pushrod or something else?

i told you once.its a slight knock.dont believe me,pull the pan.youve got a worn rod bearing.its not bad and will go for a very long time,but its still a rod.now be a good boy,buy a repair manual and have at it.that lower would benefit from a set of rods and mains and be fine for another 100,000 before it gets noisy again.if you dont do this and let it go,you will need a crank grind.the rotation of the engine throws the sound.trust me on this.