I'll be interested to hear what others have to say about motors but I opted for a 8.5 for my ProCat runner to give the belts and diffs a chance.
In the picture the car has a period option slipper but I've since made a custom on that takes modern Schumacher slipper pads and spur.
I'm running Schumacher small bores which fit fine and work great. I'm not sure if big bores would fit but I prefer the small bores anyway even on my KF.
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