Yes, $12,000 for a set of assembled heads is a tad steep. The CHI 260cc CNC fully assembled heads are $4,600, bare $3,000. So $1,600 for valves, springs and assembly. Double that for 4 valves per cylinder that comes to $3,200 plus heads is $6,200.
Still, for $12,000 fully assembled you will have an extremely rare Cleveland. It should be worth some serious horse power and popping the hood on cruise night it will be some major BLING!
Not your run of the mill Edelbrocks.