I was just doing my daily slog through E-Bay and found several sets of Aluminum small block Chevy heads for around $600 + $50 shipping, fully assembled. They were available as either 190cc or 210cc castings with 64cc chambers and 2.02/1.60 valves. The chambers looked like a modern design too. I have never heard of Pro Comp heads though. It is definitely a bargain price, but are they any good?