I have a chart, it says 46mm for the 54 cc saws and 49mm for the 60cc saws. Not sure if the chart is correct but it sounds like it.
They all have a 32mm stroke if someone wants to do the math.
In case anyone wants to know, bore x bore x stroke x number of cylinders x .7854 will give you the size of the engine. It does not matter if metric or inch system, all units must be the same.
46 x 46 x 32 x .7854 = 53.181
49 x 49 x 32 x .7854 = 60.343
A 360 chrysler is a 4" bore and 3.58" stroke
4 x 4 x 3.58 x 8 x .7854 =359.901
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