hi im Fabian and im selling a set of used champion heads. i bought the motor from a friend of mine but really only needed the block since i had a set of heads already. they are in good condition, i had them checked and refreshed. the heads are o-ringed and they have titanium retainers and also have manley valves. i'm looking to sell them for $750.00 or better offer. please contact me at negra107@hotmail.com or you can call me at (786) 356-7000.