the reason for the increase in HP is that is allows you to run a loser ring set up ( less friction)..the pump will help create a tighter seal by creating the vaccum...which results in greater HP...the longivity of the motor coming into play would be where it pulls out any excess oil ( blow by etc..) that would normally cause an engine to detonate..it WILL NOT with a vaccum pump in place..which results in longer engine life..DETONATION = ENGINE FAILURE..
be sure to run the vaccum pump relief valve...Moroso is the choice i would go with..
if there is any other benefit ..i have not heard of it...
thanks brian
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "