143 is for old school carb engines, 160 is for the modern carb engines and EFI's, and 180 is for closed cooling. The 160 is the one to go with for better idle quality and performance. I bet that 180 T-stat sure made alot of steam on a cool day with it running.
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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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