Hi, we have got the head off my 2200TC and there is a bit of a ridge at the top where the piston stops. Some of this is carbon build up but not all and. Is this too much of a problem? The mileage is unknown. The rest of the engine looks in great condition. What would be your advice be on the rebuild. Can the 2200 take a rebore if the worst came to the worst? That would have to be a last resort on my very budget rebuild.