Dez you are awesome, you literally have a response for EVERYTHING! I am going to send them my old cylinder. I am trying to cut cost... The work they do seems top notch... Now if i could find a good used head at a decent price, i'd be happy. But ebay is full of heads at almost the price of a new one.DON'T sleeve or bore a factory cylinder. It decreases the water jacket and then it runs hot. If you want a stock bore buy a factory cylinder or check with Millennium Industries or it might be Millennium Technologies. They strip and re-plate factory cylinders. If you want a big bore cylinder get it from Cuervo with the bigger water jacket. If you go big bore you'll also need studs and a SCE head gasket.
FYI, years ago there were a rash of sleeved cylinders that after a few hours of expansion/contractions of dissimilar metals, the sleeve would slip out of position.
Have you checked your cylinder? It may be good! If you want reliability go with factory bore.