Bob wrote:

On Apr 6, 9:17 am, "James" wrote:
I'm looking for a site that has information on these two engines.
I'm about to acquire one not sure if it's QM or GM. Is raw water
cooled would like to possibly convert it to fresh water cooling.

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Hi:

As a 3QM30H owner built in 1978, why do you fell it is necessary to
convert to fresh water cool?

I am braced for all the flames..........................,
Keep It Simple Bob

We're considering adding a hot water heater to the boat. Jim

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