Welcome to iboats, Magnum. <br /><br />More torque, less fuel usage, thinner bonnet.<br /><br />That's about it, unless you can be specific about what looper you mean.
There never were a 140 crossflow, prop rated horsepower. The old 140 was cranckshaft rated and is more like a 115. At wot, it should be horsepower to horsepower, but up thru the rpm range, the looper will have more torque and you will feel it like a bigger motor, what it actually is too, as the loopers have larger displacement combined with more effecient combustion too.
<br /><br />More torque, less fuel usage, thinner bonnet.<br /><br />That's about it, unless you can be specific about what looper you mean.