1955 dynaflow differences

[soulbrother]

Hi! I´m trying to identify the Dynaflow in my 1955 Century (series 60). I know that there was a difference between the Dynaflows used in Special/Century (series 40/60) and Super/Roadmaster (series 50/70) but I would like to know if the length differs and if so,how much?
I would also like to know if the 1955 Dynaflow should have the text "TWIN TURBINE" casted on the bell housing? Mine has,but no other 1955 I have checked.
Thanks!

[Airy Cat]

The 50/70 series Dyna Flow is about 3" longer than the 40/60 series.
I used a 50/70 series in my Special by using the output shaft and rear housing from my 40/60 series.