Over the decades Lycoming has made many different models of crankcases.
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Don't hesitate to contact us if you have any questions. Avco/Textron Lycoming Engine Series O-235, 290, 320, 340, 360, 390. O, IO, AIO, AEIO, LIO-320. O, IO, HO, LO, TO, VO, LTO, TIO, IVO, AIO, HIO, LIO, AEIO and LHIO-360 GO, VO, GSO, and TVO-435 O, GO, IGO, GSO and IGSO-480 O, IO, VO, IVO, TVO, HIO, IGO, TIO, AEIO, IGSO, LTIO and TVIO-540, 580 series TIO and TIGO-541 IO-720