X mark on Mark IV head

How do you add photos to this site. There used to be a paper clip symbol, now I see nothing. I’m frustrated

Hi,
I have a 1948 Mark IV. The engine looks a little different than another I am comparing it to.

It has split exhaust manifold, two per
And it has an X on the head

Does anyone know if there were different engines offered?

How do you add photos to this site. There used to be a paper clip symbol, now I see nothing. I’m frustrated.

Post a photo for comments?

Move over to the pre-xk forum, this topic is right up their street.