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My 1071 is on plus 60 and looks like it needs boring. What are my best options, presumably 73mm or sleeve it back to standard? And what pistons are recommended for a fast road motor.

Cheers

You can get 72.5mm pistons from Keith Calver , depends on the amount of wear, it's 12 thou bigger than you have.
Second time this week I've mentioned him, don't work for him and other than buying some bits I don't know him lol!

Thanks

Not far from me and need to go over that way soon for work.

Steve get Southam mini metro to fit new liners back to standard best way out cheers Brian.

If it were me, I'd have the block sleeved back to either standard or +0.020". Sleeves are available that will take boring to +0.040" over the initial finished sleeved size, so say you go for standards, then it can be done again at +0.020" and then +0.040", so you'll get another 2 'goes' for the investment.

There seems to be a negative view of sleeves and I really can't see why. Half decent sleeves are a better bore material than the 'straight' blocks are and from my experience, the bore and ring life is usually around 3 times that of un-sleeved blocks.

Cheers chaps, I'm going to have a word with my engineering shop and Keith Calver tomorrow and go from there.