More info...
The T-stat Deve has that looks like a kitchen sink strainer is found in my 1963 Parts Book.
1962 Ser 60-80 (exc. Diesel)...T-stat assembly (180*) (Harrison) (16-1/4" dia bypass holes)...3151250
My 1967 Parts Book has this same listing for 1962 but add it's for (261, 348). It also list it being used for the 1964 Ser 50-60 (292).
Mike B
