I believe that to be the case Hobby. I have a short block that will be the base of the build that is cast as an EJ25 B25C 704. It will be getting all the other stuff off of an EJ25 B25c 702. When I look inside the short block it appears to have upgraded internals. Pistons have a P/N of 291061 and a secondary number of 815032. I have not tried to look these up yet. The rods are of an H beam design and I cannot see any markings other that what appears to be a lot number of sorts on the crank end.

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I don't know if you have tried it, but oven cleaner and a scrub brush worked great to clean up the block. You have to be a bit careful as it does eat aluminum so you don't want to leave it on long. You end up with a bit of a darker gray, but it is clean.

Here is a couple pics of those trailing arms.

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