I'm using new shimano alivio 8 speed cranks, Looking at sheldon's page, it seems I can use 110-113.
M430 / M431 ? Check the product number on the bac
All the techdocs and info are on shimano site for them. You should have the installation instructions with them as well.
If it's the square taper version then they say to use 113 length as it's designed to have a chainline of 50mm (being modern)
Although M431 say LL123 which could either be a typo of LL113 or they now give a 122.5 the coding LL123 and you need a 122.5/123 bottom bracket. But then the older version also has this same numbering.
I dare say (but do not know), you could fit a 107/110 in there and move to the more retro 47.5 chainline (if you've not fitted a modern front mech with it's shims that is) for the M430http://techdocs.shimano.com/techdocs/bl ... ID=jNpbGrM
(The SI-xxxx links)