Re-enforce the ears before you put a lot of time and money into polishing the cylinder.  The cylinder also needs some welding repair to build up the area where an ill-fitting pipe has be against the cylinder near the head gasket surface.

A note to all that are considering polishing their head and cylinder:

We are currently working on another cylinder and head that someone got carried away when polishing.  The o-ring that fits into the space between the studs and the outside of the head needs a specific dimension so the o-ring will properly fit the groove.  The proper 0-ring groove dimension sets the o-ring groove very close to the outer edge of a stock unpolished head.  When the head and or the top of the cylinder is sanded, ground on and or over-polished, we often have to make the o-ring's groove outside diameter smaller than the recommended groove specification.  A smaller than specification o-ring groove dimension makes it more difficult to keep the o-ring in the groove during installation. 

We have had to weld up the outer perimeter of the head and cylinder on a number of top ends where the polishers took a millimeter or more off in this critical area.  Polishing can make o-ringing a head very expensive.  Alert your polisher to stay away from this area.

If you stock head needs replacing and you cannot find an OEM head at a cheap price, use a cool head.  New OEM heads are now over $700.00.  If you order a cool head, order it with a blank dome or something around 50 cc to 53 cc so that there is enough material so that we can machine the shape on the  combustion chamber  we like.