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Are These engines Closed Cooled?

outobie

Regular Contributor
Hello, quick question:
I believe these are closed cooled engines but can someone confirm by this pic?
I am buying this boat and just had a panic attack that I didn't confirm these are closed cooled and not raw water cooled. the Neither the listing nor any other documentation I have indicates one way or another. hoping someone can confirm by this pic.
thanks for the help

MANUFACTURER: Mercruiser
NUMBER OF ENGINES: Two
YEAR: 2006
MODEL/HORSEPOWER: 370HP TVD-8.1 S Horizon
ENGINE SERIAL NUMBERS: OW393995 & OW397018
engine pic.jpg
 
thank you. I thought that looks like a plastic pressurized overflow container on each motor but wanted someone with more knowledge to confirm
 
The one on the port side you can see the heat exchanger at the very front of the engine (long cylinder shaped object).
 
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