This was some type of Frankenstein project based on some Norbert Keeley castings. The person who started these was trying to make a couple of twin cylinder versions. There is enough to make most of one twin cylinder engine and one single cylinder engine plus some extra castings, or two twin cylinder engines if someone got creative. The twin cylinder project asking $150 the single cylinder project $100 and the extra castings $40. or open to offers on this one.