1948 1/2 ton truck w/ 216 engine. Radiator had a 0 psi cap. Double ear.
1955 1/2 ton truck w/ 235 engine. Radiator had a 4 psi cap. Double ear.
General wisdom is that old radiators can't take a lot of pressure and may rupture.
If what you have is working well, general wisdom says, don't mess with it.

The 1950 Chevrolet MPL (Master Parts List) calls for a radiator 3118968 for 1947-50.
Harrison could have made a radiator 3118967 that fit Chevrolet trucks and other applications.
Harrison stamped the number in the upper radiator tank, not GM, so a Harrison radiator manual is needed.
Attachments
Radiator.jpg (91.03 KB, 83 downloads)

Last edited by buoymaker; 04/12/2022 5:02 AM.
"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."