Just like it says. The core is only for the SV and a good shaft with no "incidental contact" with the housing. The one I have has major play and had the fins wear a little bit on the housing, therefore it will be out of balance and the specs will be too loose when rebuilt. I need the SV too since the one I have doesn't have one on it. Also, I have to get a GOOD T2 style WG can that will allow for clearance(intake runners) and won't give me issues. I think it has to be a large can from what I've read(I think). You can PM me back. Thanks.
Nate