Are these adjustable rockers? Olds Rocket 324

Also; what is the difference between a #7 head and a #10?

 

Rockers-no. Heads-can't tell ya.

 

There isn't any adjusting mechanism visible.The only adjustalbe rockers for early Olds were aftermarket aluminum rockers.

 

except for the steel and magnesium ones.

valves are larger and I'm pretty sure chambers are smaller in the later heads,
not sure about difference in runners..
'don't have any #7 heads in my pile