1955 235 - what is the engine serial number?:

An early 1955 truck 235 with high-mounted water pump; or, later 1955 235 with low-mounted water pump (which would most likely have 1956 specs)?

In 1956, the 235's thermostat started opening at 157 degrees and was fully open at 183 degrees
6.25 psi to 7.5 psi pressure cap

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.