A friend came to me with a cylinder head stamped E-12. It also has a stamping of 73. Would that be the year? It looks to be a completely rebuilt cylinder head (new valves, rockers, etc.). What would something like that be worth and are any of you guys in the market for one? I am an E-21 addict myself (I currenly have 4). I could provide pictures if there is enough interest shown. Gary