Rick, There are considerable differences in cases......especially ones in oil circulation and starter, drive... 75 up is similar for -12's but not for -8s. Early C cases are different from later C cases...0200 have mountings for lord mounts, earlier use the continental rubber mounts., etc..
So there are lots of changes.... "it is not possible to convert any -8 model to a -12 model because the -8 crankcase is not adaptable to the -12 crankcase cover in several respects."---quote from Continental "C" Series Maintenance and Overhaul Manual... Regards, Harry Francis 93530 Blacksburg, VA.
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