the plating helps displace heat better then a steel sleeve
it shouldnt be bored out unless your installing a new big bore sleeve or installing a cheap steel big bore kit,,,which would needed to be replated anyway,,,,,either way nikasil is the way to go
On the sleeve there are two ways to go. The cast iron liner or nikisil. The nikisil is not chrome, the liner is Aluminum and than is coated. You can send it out to have redone. if you Bore the stock liner you may have issues with the thinkness of the sleeve when your done.
Nikisil is coated on the inside of the sleeve and allows better heat transfer to the cooling system. This is a good thing. In a big bore kit you may see new sleeves that may require you to do some case work, this will allow for a thicker sleeve and reduce the chances of sleeves distortion.
If you go with Iron it will save you some cash though, you may also need to tell the parts guy so he give you the correct rings.
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