From the Dealer's Data Book
Attachments
HD 3 Speed 1954-1955 01.jpg (77.36 KB, 41 downloads)
HD 3 Speed 1954-1955 02.jpg (52.11 KB, 41 downloads)


"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."