2F PISTON SHAPE?

[Rotor]

Can anyone tell me the shape of 2F pistons, flat,domed or concave?
I intend fitting a 2F head to my late 74 F engine ,some may remember my posting from earlier this week,My F engine has flat topped pistons ,Im hoping 2Fs are the same so I dont lower the compression ratio.
Thanks
Rotor

 

[Poser]

Depends on the year.

Earlier, 2F's had domed pistons, the later ones, post 79-80 and on, were flat topped, with a smaller combustion chamber in the head.

Good luck!

-Steve