Block Rebore

["Jerry C Shaw" <slowtoaccept@yahoo.com>]

Bentley, page 114, Cylinder Block, Rebore, Item 3., reads: "Maximum rebore 
oversize from standard is +0/020 in. Cylinders that cannot be satisfactorily 
rebored when this limit may be sleeved to restore them to the original size"

Apparently, everyone ignores this, otherwise, no one would sell 0.040" 
oversize piston sets. Just ordered 0.030" oversize pistons.

What's the deal? Any risk here?

Thanks
Jerry

'74 TR6