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First post here - and just my luck, Sailingdog is watching....
I don't know the Freedom 32 layout but in my view it's critical that the incoming raw water has no possibilty to siphon into the exhaust valves after shutdown. Various websites recommend water to engine connections at least 12" above waterline or an anti siphon valve that needs to be regularly checked for sticking. As an alternative I suppose you could immediately run down and close the thruhull every time the engine is shut down.
Without the anti siphon valve a riser by itself is not enough. The water could still siphon uphill using the very convenient water filled small diameter submersed intake line, then back up against against the exhaust riser, and flood the engine.
On the exhaust side the thruhull is thankfully above the waterline, the diameter is larger, and the riser is usually substantial, so unless the boat is overloaded, heeled or attacked by wierd wave action, siphoning is not as likely to happen.
Hard to believe this day and age that 20 seconds of cranking can sink a properly installed $20K engine. Also hard to believe idling will glaze it up; don't truckers do this all the time? oops, sorry - that's probably a new thread.
Mike
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