Here is a clearer picture:
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Gil,
Thanks for the info. The photo is interesting. One thing that I notice on my engine is the massive journals on either side of the connecting rod. They are huge and thick. They definitely weigh more than the flywheel.
I tried looking up Mack's steam engines and there is just nothing there other than a steam locomotive.
Gene
Perhaps I wasn't clear enough. My intent was to simply suggest the box bed frame and crosshead guide looked similar.
There were also many other suppliers of steam engine parts castings.
Clearly the crosshead itself and bearing blocks are different.