You can install 1 PCV valve. but one has to vent to atmosphere or else you will get all kinds of oil leaks. 2 PCV valves most likely will not be able to keep up with the blow by, and teh excess pressure will push oil out the seals. Leave it like it is, or you can install 1 PCV valve as later boats did this.
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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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