This is the crankcase for the O.S. Max .55 AX ABL Aircraft engine.
Includes: O.S. Max 55 AX ABL Aircraft Engine Crankcase
Requires: Installing all engine components into and on crankcase
Displacement: 0.545 cu in (8.93cc)
Width including mounting tabs: 2 (51mm)
Width not including mounting tabs: 1.4 (35mm)
Width between mounting holes same side: 0.69 (17.5mm)
Width between mounting holes opposite side: 1.7 (44mm)