I have some big duke heads. 22538816 olds. they are the olds nhra 3815 production. made for pro stock. and a brand new big duke intake. the heads were ported by dart. also have a indy blower intake for for big chief heads. Heads have never been hurt. Heads have no valves or springs. 2600.00 for heads and big duke. 700 for blower intake. keith 606 402 1077. text or call. .