its a portability the lifters have bled down and need to refill with oil. iv had 5.3L lifters do weird things. put head gaskets on one once and had zero compression because the lifters were holding the valves open.
see if you can find where the noise is coming from (front/back). did you leave a rocker arm loose?
hint... if there is only ONE tap noise then you didnt swap push rods around. then there would be two noises.
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The dumbass that shows up randomly 10 years after selling the car.
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