Valve Seats?

[manuelc]

I am in the process of building an 8BA motor for my 40 ford. I have a real nice block that has been cleaned and is in great condition. My question is that it appears that only the exhaust valves have valve seat inserts. It looks as though the intake seat is the block? Is this how they were made? When I send it in for bore and valve work will they cut and install seats where there are none or just grind what is there? (the block?) Any help would be appreciated.
Thanks