Post deleted by rbstroker

Well that is a hard question but they are never to their blue print spec.
Decks can be higher than spec and heads are almost a given to be several cc over spec.
so .5 to 1 number are the norm seemed farther off in the 74 to end years. so if you picked .750 as a average for below advertised compression would get you in a ball park of true numbers.

So if you were to say OK a 10.5 to one would be 9.75 to one as factory assemble you would be close.
10 to 1 maybe 9.25 to 1
8.5 to 1 7.75 to 1 .
Every motor will vary on how much it is off spec so there is no magic formula

Without actually purchasing one and tearing it down, I'm trying to figure if some of the later 440's actually had compression ratio as low as 8:1 or lower. If so, what would the camshaft specs be and would a modern grind and fast advance curve make one of these engines perfect for a street driven car able to use today's terrible gasoline.