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Does anyone know the bridge clearance for a 1998 400 EC?

I sea trialed 1998 400 EC - here is the issue. The boat has Horizon mercruisers 7.4 new long blocks installed in 2015 with approximately 100 hrs on them. On the sea trial the port engine WOT 4600, Starboard engine was at 4150. What can be the issue ? I was thinking bad cable, possible dirty air...