Originally Posted by birkey
I take it when you got to order a cylinder head, if it doesn't specifically say which shape it is, then it is the typical wedge shape?
With a modern production and many aftermarket SBC heads, what you will be looking at in most cases is a fast burn
combustion chamber. These are usually heart or kidney shaped and have quench pads on both sides of the combustion chamber. The Vortec (shown below) is representative of such a chamber.
Click on image for brief article on Vortec head
More info on one reason for the Vortec and other fast burn-type chamber shapes can be seen here