MOST transoms i nthe 70's were 20" in as 25" shafted engines didn't get popular until the late 70's. Up until then offshore boats had either an I/O or an inboard. It wasn't until the mid 70's that outboards came out with enough HP to push boats of the size that peopel would venture offshore in. For most lakes and such a 20" transom was plenty to keep the backwash out. I'm not saying they didn't have 25" shafts back then, there just wasn't that many.
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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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