Internal temp is the best way to prevent drying out the fillets. Since you mentioned a pit temp of 165° I'm assuming you will be curing then smoking? These fillets were smoked until 145° internal. Some people like them a little drier, so 150° would work for that.
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This fillet was also cured and smoked to 145° to give you an idea of what the internal looks like.
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I use a Big Chief box smoker, so at best I can get 180° smoker temp. This might take 2 hours for the fillets to reach 145°. In cooler weather, or if I'm smoking thicker fillets, at the 2.5 hour mark if the fillets are not nearing 145° I move them to a 180° to 200° oven to get them done. Much higher on the oven temp and you risk forcing too much of the albumen out of the fillet. I generally see a pocket here and there, but I just try to keep it to a minimum.Looks awesome. Do you recall how long it took to reach the 145* ?