Technical Marelli CW78LPS spark plugs

[ants2au]

Hi,

does anyone know what the heat range direction of marelli spark plugs is?

is 78 in between cw7 and cw8? ie is 78 colder than cw7 and hotter than cw8?

is there that much of a difference between cw78 and cw8? if not, why is there cw78 in the range?

cheers, Anthony