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707C Muffler Information

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I have a 1965 B Model with a 707C Gasoline motor and wanted to confirm the proper muffler for the truck. It is a 1000 GPM fire pumper and the current muffler has a 3.5" inlet and a 3" outlet. The muffler body is round and is 38" long. The Mack Museum has provided some drawing but they do not match with what is currently there. Any help would be appreciated.

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