[keane]

Hi, it really does depend on that particular block, see if you can find anyone to sonic check the block, not sure what the min cyl wall thickness needs to be on a 400, 429/460 blocks generally go +80 no problem, + 100/110 also possible, but a sonic check will give you the reading of the thinnest wall so you can go from there, search the US sites for more info, hope that helps. Dave