I have a mk 2 cooper s block that is currently on +60 thou but looks like it may need to be bored. So my question is can I bore it out again and still be able to reline after that if necessary? If I can what is the max piston size I can go to?
I see GR sells a 72.5mm (+74thou) and there is a 73mm (+94thou)

Cheers
Rod

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1967 New British Racing Green Mk1 Cooper S, 1967 Lake Green 1275 MG Midget, 1969 Jet Red / Crystal White Mk2 Cooper S, 1972 Gambier Turquoise Clubman GT (ex police), 1972 Camino Gold Clubman GT, 2009 JCW Challenge Edition, Megane RS265, Clio RS220.

You can go 72.5, 73.0, 73.5. I'm pretty sure GR has sleeved S blocks back from 73.5, ring him and check.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

has the block been offset bored to get it to .060" ?

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did I tell you that I won a trophy?

Not that I'm aware of.
Cheers
Rod

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1967 New British Racing Green Mk1 Cooper S, 1967 Lake Green 1275 MG Midget, 1969 Jet Red / Crystal White Mk2 Cooper S, 1972 Gambier Turquoise Clubman GT (ex police), 1972 Camino Gold Clubman GT, 2009 JCW Challenge Edition, Megane RS265, Clio RS220.