I hope not but not would bet too much on it.
I saw at least two production boats from major companies that had such a
flaw.
The 1st was an Elvstrom designed sailboat with a Volvo in the saloon, under
the table. It counted on air from the bilges to run and died after 10
minutes unless you opened the box.
The other one was a sportfishing boat in the 40' range. The owner wondered
why with the same engines he could not go as fast as the other boats in his
category. During a sea trial, I noticed that you could not open the engine
hatches: they were sealed tight from the vacuum! I wedged a piece of 2x4
under the hatch and the boat ran 5 knots faster!

That Chris-Craft may very well have been designed for a gas engine that does
not require as much air.
Anyway, I was just trying to help.

--
Jacques
http://www.bateau.com

"P.C. Ford" wrote in message
...

Chris-Craft would not design a boat in which the engine was sealed so
that it would not run.