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March 31, 2018 at 2:31 pm
#73277
According to the Merc Master Master Manual for 1965 and prior, the bore for the Mark 10 is 2-11/32”. The manual doesn’t specify a ring gap, it simply says to use a ring expander and seat the rings into the grooves, ensuring that the rings float freely in the grooves after lubricating with oil and align properly over the locating pins.
JP