Hello, Riggles,
The "Blue Flame" 1955 engines was the name of the car engine.
All 1955 235 engines were lower compression engine than the 1956 and later "848" head 235s (cars and trucks).
Here is a collection of Specifications Manuals for "Stove Bolt" years.There is information for cars and for trucks.
In each part, there is an engine section with specifications that you are looking for.
Find and post the codes shown on this page.We can then help confirm the year/type 235.
My shade-tree opinion regarding installing hardened seats in a 216/235/261 head is the same as Joe's: they are not needed (for non-race-car driving).
