I just finished up machining two sets of heads for a customer replicating camel hump heads for a Camaro restoration. He wanted high performance heads that looked just like the originals. I machined the logos off and then machined the inset by hand around a 3/8” thick steel guide. After the rough machining was completed I dialed in the edges with carbide bits and sanders to detail the edges and replicate the edges. I completed the heads by hammering the smoothed areas with a pick hammer then hammered forty grit sandpaper to roughen up the surface to make it look like the factory castings.
Original Camel Hump Heads