Bruce Butler Wrote:
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> Matt Farnsworth Wrote:
> --------------------------------------------------
> -----
> >
>
> HOWEVER, since the last GP7's were built almost 60
> years ago and the last GP9's were built some 54
> years ago, subsequent rebuildings, modifications,
> etc have blurred these differences. The most
> significant difference between the GP7 and the GP9
> is internal. The GP7 was built with a 16-567-B
> engine, which had square airbox covers, while the
> GP9 was built with the much improved 16-567-C
> engine, the first EMD diesel motor with ROUND
> airbox covers. All EMD 2-cycle diesel engines
> built since the 567-C have had round airbox
> covers.
>
> EMD developed a retrofit kit for the 567-B engine
> that gave that motor some of the advantages of the
> newer "C" design. Many roads re-fitted (ie
> "upgraded") their 567-B equipped locomotives. An
> upgraded block was then known as a 567-BC. In
> other cases a 567-C engine would replace a "B"
> engine during a unit rebuilding project. Both
> blocks are interchangeable in the carbody. I am
> even aware of some instances where rebuilt 567-B
> (or 567-BC) engine was put into a unit originally
> built as a GP9. For example C&NW's ex CGW shop at
> Oelwein IA did this in the 1970's.
>


The EMD 567-c primemovers on SP's GP and SD 9's were modifyied to use 645 power assemblies