The flywheels are not ballanced any differently but you might want to take note that all 292 flywheels after 1966 have 1/2" bolts in contrast to the 7/16" bolts on the 194, 230 and 250 CID motor. So if you want to use your 250 flywheel on a 292, you will probably have to have the flywheel drilled out to 1/2" bolt holes. The bolt circle spacing is the same so it's not a big deal. See page 26 of Inline Power Manual for details.
