On Fri, 8 Sep 2006 03:52:36 -0400, "Eisboch" wrote:

I have a friend who has an older 38' Hatteras that originally had big block
gassers and the boat's fore and aft balance was designed for the weight of
the gas engines. At some point they were removed and replaced with a pair
of DD 6-71s. The result was a reliable, but stern heavy boat

6-71s are about 3,000 lbs each vs maybe 1,300 lbs for a 454. That's a
lot of extra weight, and is why the Yanmar or CAT 3208 swap is more
common. The Yanmars come in at about the same weight and size as the
originals.

The 6-71s have far better longevity of course.