When Dally says that his heater sure does help a bluff. what does he mean?

When Dally says that his heater "sure does help a bluff," he is referring to his gun, which he uses to project confidence and assert dominance in tense situations. The term "bluff" suggests that the presence of the gun can intimidate others, even if Dally may not actually be as tough as he appears. Essentially, the gun acts as a prop to enhance his bravado and influence how others perceive him.