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I Forge Iron

Champ 40 vs 400

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A buddy of mine is giving me a champ no 40.   I have two champ 400s.  One I am trying to rebuild as a back up.    I am trying to research if the the 40 is older or newer than the 400.   I suspect older.   But can anyone tell me the difference?   potential age?, parts interchangeable?, flow capacity?   Here is a pic.   I have done several searches but have not founf anything on when things were built and how the two compare.   He said it blew well and was pretty quiet. mostly a whoosh/purr of air and not gravely sounding.



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