Factory electrical guages are notoriously inaccurate, go down and by a mechanical guage(or borrow one) and see what it really is before you get worried. Also make sure your useing 15W40 ROTELLA or DELO 400 oil as marine engines work alot harder than there automotive counterparts. 220HP I wanna say is the max HP for most of the 4.3L's except MPI engines. The 200HP rating was for outboards, I/O's were 230HP up until 85 and then 260 in 86+.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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