Draining & Fushing anti-freeze from enclosed cooling system

[pescador42]

I have a 1985, 470 merc cruiser engine. I want to drain and flush out the old anti- freeze and put in new. Where is the drain plug on the front of the engine?

 

[pugetsounder]

You will probably find everything you need here:

http://www.acmeboatrepair.com/pdf/MercruiserMCM470_Owners.pdf