Not sure which Maney cases you are asking about, the 1007 or all the rest. The short answer is that the Maney 1007 cases take a wider crankshaft, but not the MK3, which is wider than the previous crankshafts, but still has the same width between rod journals. The bores in the 1007 cylinder are moved outward 1 mm on each side to allow the larger 83 mm bore. The crankshaft is wider by the same amount, to move the rod journals apart and put the connecting rods in the center of the bore. The crankcases are wider to take the wider cylinders and crankshaft, and to have room for the cylinder through bolts to be moved outward. If you use the 1007 crankcases and cylinder, you need to also use the wider crankshaft. If you have a MK3 dimension Nourish crank, and use a set of stock MK3 crankcases, you will not be able to use the 1007 cylinder and head. The only way to use a stock 89 mm crank is to fit a wider flywheel. That's what Steve does for his 1007 crankshafts.
One of the interesting side effects is that you can fit the 93 mm stroke 1007 crankshaft to standard cases just by replacing the flywheel with a narrower one, add an 81 mm bore 920 kit, and have a 960 cc Commando. At least a couple racers have done that, and it's a lot less expensive than going the whole 1007 route.
If you're asking about the regular Maney cases, not the 1007, Steve has done them in both MK3 configuration, to take the wider MK3 crankshaft, and pre-MK3 configuration to take the earlier crankshafts. You can fit the earlier crankshafts in the MK3 cases by using spacers, but the MK3 cranks fit only in MK3 cases.
That's probably more answer than you were looking for, but somewhere in it should be the answer to your question.
Ken
