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Has anyone ever done a "cylinder index" thread on this forum? Your cylinder index (C.I.) is the total number of cylinders of internal combustion that you own (autos, trucks, sleds, bikes, mowers, chainsaws, string trimmers, etc). The only rule is that the cylinder(s) must be in operating condition, no, that 1947 chev pickup that has been setting in the trees for 30 years does not count. List them if you want. My C.I. is 38.