On Mon, 20 Aug 2007 10:00:33 -0700, Tim wrote:

Interesting. I know the old 6-71 "jimmy" was a 426 CID and was rated
at 238 hp in a standard (not marine) configuration. So I'm amazed that
the little 3-53 can obtain 100hp.

The naturally aspirated (non-turbocharged) 6-71 can produce up to 320
hp depending on the injectors used. I have the Johnson & Towers 280
hp version on my trawler.