I have been burning some spf 4x4s and 2x4s that are 60 yrs old. I have noticed that the 4x4s burn much longer and with more heat much more than one would expect from a 4x4 alone. (They burn longer than rounds of red maple of larger size). Has anyone ever noticed this? It seems as if they hold much more sap. Maybe this is becuase they are heartwood? It could also be tight grain structure?
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