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Can you use different merc lower units on a 1979 80 hp merc

"Chad, Most 4 and 6 cylinder

"Chad, Most 4 and 6 cylinder lower units from the early 70s to the mid-late 80 will fit that motor. Your 4 cylinder lower unit may have a 1.85::1 gear ratio, versus the 6 cylinder motors which ususlly have a 2::1 gear ratio. This may cause you to need to different prop."
 
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