You get a better fill with the fiber-wrapped because it doesn't heat up as much as the metal does, so it doesn't have to cool down as much so you don't lose as much pressure. I'll put it this way you get a fill on a 68 3000 the fiber wrapped will drop to around 2800psi after it cools and the metal with drop to around 2400psi. someone correct me if I'm wrong.
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