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Originally Posted by Miles Offshore
Just waiting for the crane to come set the vortec in the boat hopefully in the next few days. Ran it in the garage today and it sounds really good. I am told that the main advantage of the dry stacks is that if there is a water leak it will leak to the outside of the manifold/riser joints and not to the exhaust like the old style do. Meaning water wont leak back into your cylinders and major or catastrophic damage. The best i can explain it and it makes sense to me and worth the extra money. So i dont have any numbers yet but the 260 hp previous motor i had i was cruise @20-22 knots @3200 rpm and 9.5 to 11 gph. Running a 16X14 wheel. Hoping i can achieve 25 knots at about the same rpms and fuel burn with the extra 60 hp but we will see lol.
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Seems reasonable to me. 60 extra HP should be noticeable and provide the increases that you are hoping to achieve. The Vortecs are defiantly more efficient than their predecessors. Agree on the dry stack theory as well especially with raw water cooled risers. Good luck and keep posted on the outcome.