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Hemingways don't list the Gypsy on their website but supplied a set of three castings to me as a special order about 18 months ago. The castings are fairly good in themselves but there are some simplifications/omissions in the patterns - no showstoppers though. If anyone's interested I'll post a...

Your casting looks similar to the Hemingway casting that I have (pictured). There is insufficient meat on the casting to drill the oil holes for the two end bearings. However, I'll only ever run the engine for short periods (if I ever get it to run) and I'll rely on enough splash cooling for...

Ringsnapper, When I made the crank for my Gypsy, I also noticed some issues with the crank drawing. The attached sketch shows my own interpretation of the dimensions. Here, the original dims have been converted directly to metric. In order to get a 3 degree taper, the length of the taper needs...