Zephyrs - were they 2.6 litres?

[Ray Bell]

The famous Ford Zephyr, built from about 1951 or so with a straight six, which was superseded around 1964 by a V6 in the Mk 4. Now, please tell me, those who can, what sizes did that engine come in - as fitted to the Zephyr?

I was under the impression that it was only a 3-litre, but now I'm told there were 2.6 engines too.

Please understand that I know the straight six was 2.5 or thereabouts, maybe even 2.6 in the Mk 3, but the question is just about the Mk 4 and later with the V6 engine.