That is a good point no doubt the 470 has more torque than the 3.0. But it also is made from two dissimilar metals, has a water cooled voltage regulator, a prohibitively expensive manifold and riser, a stator that likes to fling magnets, weighs more, idles like a tractor, etc. etc. :-). I am leaning towards the 3.0 because it is available, much newer, cheaper and easier to maintain, will use less fuel, lighter. The biggest con is the power and was wondering how a 3.0 actually performs in the V-20. Looks like I will need to install one to find out.
Brian
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