It can be done very successfully, but not by an amatuer. The duty cycle of
an automotive engine is around 30%. Marine engines require a 100% duty
cycle. Converting an automotive engine to marine involves far more than just
cooling system and exhaust. However there are firms that sell conversion
kits that do a reasonably good job without extensive engine mods, but be
careful. Under no circumstance will you ever be able to open up the trottle
and run the boat in that manner, because the engine will self destruct.
Steve

"Steve Morrisby" wrote in message
...
Hi there

I have been looking at the UK market for a 75HP marine inboard engine.
Those
that look good are products from Volvo, Betamarine and Lombardini, but
what
a price!. I struggle with the fact that my new car cost less than one of
these and that got me to thinking if I could do it myself.

What are the pitfalls in "marineising" a good used truck engine, are
aftermarket kits sold and what about marrying the gearbox to the engine
bell
housing.

I seem to recall reading a thread on this subject some years back, but at
the time I was not too interested. Now of course I cannot find threads
going
that far back.

TIA

Steve