The parts are so similar that we usually keep EA71 core engines together until we need to rebuild one. Over time (and careless or forgetful employees), parts will get mixed in with EA81/EA82 stuff. It drives Rick nuts to be in the process of an EA71 just to discover that what he trusted were the correct parts supplied to him...aren't!
So he has to go into his stash and find the missing pieces. That is, IF we have them.
That's another reason we've been telling folks we aren't doing that engine anymore. (Curiously, there's one in process at this very moment.)
The only item we don't have problems with (yet) is the piston rings because we buy from the manufacturer who supplies Subaru.
As a member of the Subaru community, we'd like to keep supplying something that nobody else does as long as there is a need for it. As a business, we have to consider the fact that the EA71 is a huge pain compared to the much more in-demand (and profitable) EJ series engines.
I guess we'll consider them on a one-at-a-time basis.
Sorry, it's Sunday morning and I tend to ramble....on and on and on.
Emily
http://www.ccrengines.com