The engine you describe sounds like a 60 degree looper OMC which is like Spare said an optical ignition system engine. VERY good engines, and easily argueably the best engine OMC EVER turned out. They are also one TOUGH SOB. As for the extension on your MERC driveshaft, this is pretty unadviseable even from BAY who makes the adapter kits. It is ALWAYS best to go with a 25" lower unit with the spacer kit.
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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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