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Adding/confirming what MIke says, GG2, this is from Thomas Warth's Mack EH-EJ-EM-EQ-ER-ES 1936-1950 Photo Archive:

10,661 were built between 1937 and 1950. Original cab-over engine (EQU) was 16,000 pounds with the EQ at 23,000 pounds. By the late forties, design improvements increased GVW to 25,000 pounds on the dump truck, 27,000 pounds on the EQ, and 45,000 pounds on the tractor-trailer combination. The 354-cubic inch gasoline engine was used in the original specifications, and was superseded by the 431-cubic inch Thermodyne engine. The 457-cubic inch and 510-cubic inch diesel engines were optional.

Doesn't help much but might be of use if you go to look at the truck.

Whatever rubs your buddah.

The Mack E Model Registry - 103 entries
The Mack A Model Registry - 14 entries

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