In trying to continue the mistaken identity that Huck is Tom, Huck explains that he was delayed because a cylinder head blew up on the boat. What oesd Aunt Sally then ask? What point is Twain trying to make in this exchange between Aunt Sally and Huck/Tom

Tom seldom tells the truth. He usually lies or embellishes a situation like the cylinder on his boat. Tom's return signifies that logical thinking will disappear, and an excessive sense of adventure and fantasy will take over. Huck quickly takes a backseat when Tom's unlimited creativity is released upon the Phelps home.