Complicated!

1948 it is.

Here is a 1948. The bed is a little small.....
Attachments
GMC Year 01.jpg (39.9 KB, 140 downloads)
GMC Year 02.jpg (100.33 KB, 139 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."