On Tue, 25 Oct 2011 18:16:03 +0000 (UTC), wrote:

Greetings All,
I have a 12 foot aluminum boat that is rated for a 10 HP max motor.
I do have a 10 hp outboard but bone on bone joints in both wrists
makes it really painful to put the motor on. For years I have been
thinking about various schemes to put in a liquid cooled 4 stroke
inboard. One idea is to use a conventional air cooled flat head motor
that's been modified with a water jacket.

Hop in your boat and go find this old friend of mine -- he's
practically your neighbor. Note the photo labeled, "1970 - Cohasset
Harbor, Massachusetts Designed and built a boat with lawn mower engine
for power."

I haven't seen Gary in almost 30 years, but unless he's got cranky in
his old age, he'll talk your ear off about this stuff and give you
lots of practical advice.
http://mtpickettwoodworking.com/gary.htm

--
Ned Simmons