Cm870 built with CM 570 internals.

[Unilevers]

i have physically done this conversion, and it was 100% not worth it. The cams are the same if you have a big CPL 870, but thats about it. The injectors, turbo, manifold, IFSM, ecm, etc etc are all different. you have to piece together a kit manually.

In the end just buy a set of IPD 870 steel liners and pistons, decide what your turbo setup and torque loads and desired HP are going to be, and have it built and tuned properly. 870's can handle high power fairly well.