Liam's 73 V20

[Liam]

Originally Posted by bksah2

Well I must say this is a first for me I have never seen a inline 6cyl that had a heat exchanger on it ..is the motor running antifreeze in it on a closed loop

yes the lower exchanger hose( visible in 2nd pic) runs under the engine and up the other side to the water pump. The smaller hose seen on the right of the exchanger is the raw water feed.
Sterndrives are new to me, I have only ever had outboards in the past.