I don't know......It is stamped redone on the outside of the stern drive. Is
it OK just to run the Sterndrive without pipes hooked up since the water
route through the Transom goes to a blank off plate? I was worried about
the stern-drive it's self needing cooled.... The boat definitely has a
through hull raw water pickup that flows through the heat exchanger and out
via the exhaust.
Remember I am OK with anything mechanical (engines, gearboxes etc) but I am
unfamiliar with the needs of sterndrives....

James wrote:
Converted to what?

Alpha's still have a built in raw water pump. Both alphas and pre-alphas
can be used with out the built in raw water pump if a suitable pump is
driven by the engine that uses a thru-hull pickup. What you have is not
unheard of.

I have inherited a 25' MirroCruiser with a 305 and a pre-Alpha Stern Drive
(the one with loop on the top bearing cover).
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My assumption is that the pre-Alpha drive has been converted
somehow.....!!!!!