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The other design is for a vertical distributor driven off of some spiral gears which are difficult to cut or acquire and an impeller water pump:Jo
Jo , I have an orphaned Seal 15cc also but not as much done as yours. Are you sure the horizontal distributor ran off the crank? I thought it ran off the camshaft, don't have my plans hand atm to check.
Be quick Jo.I noticed Surus has OD'd on the Snickers tub.... " to the casting cupboard " !!