As British Anzani wound up making engines Harrison was already making parts for Anzani for the aftermarket, in particular replacement pistons with rings assemblies in a number of ring formats. This eventually went on to some interchangeability with exhausts elbos and lengths and tapers of alluminum exhaust stacks.
A comparisson was done with Anzani (cast iron) and Harrison (cast alluminum with ferrous sleeves) 250cc engine blocks and cast aluminum heads finding that there was total interchangeability from one manfacturer to the other and between each other. Crankcase to crankcase interchangeability has not been done due to lack of having Harrison's own custom made crankcase to compare to the Anzani crankcases at this point.
They sure were cousins from these comparissons done. How close in terms of communications were done to come this close is still only speculation.
Enjoy the pictures of these close cousins.
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