GMPP 12558060 Vortec heads bought new in box. Valve seats were blended, valve guide bosses rounded off and mild port and polish work to exhaust. Upgraded with Alex's parts 1.8" spring kit and screw in studs, good for roller cam and up to at least .525 lift. Currently no guide plates, must still use self aligning rockers. Barely used. $750 for pair. PM me for pics or check out on ebay soon.