The picture came from the GM Heritage website:
https://www.gmheritagecenter.com/do...hevrolet-Trucks/1941-Chevrolet-Truck.pdf
Original page number 60 - pdf page number 65.
Attachments
1941.jpg (149.02 KB, 61 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."