im sorry mate but i have worked A LOT of vr engine some in very good condtion and some in not so good condition but non of then have had bore wear to a point its needed a re bore .... the only time i have eva heard of a vr having a re bore is when they fitt 83mm piston ie to make it a 3 ltr .... sayin that i know of one rado engine block that needed a re hone not a rebore but that was cos it over heater and the piston picked up in the bore as the cooling system was bone dry ... but even then it only needed a re honing to the bigger ring size ...