main block drains on 350 MAG MPI

yeti

I have a 342FV  with 350 MAG MPI.  Each engine has two main block drains, one port and one starboard.   I cannot lay eyes on them. They seem (by feel) to be quick disconnects, but I am told they are either 1/2" or 9/16ths threaded connections.  Anyone know for sure? 

skennelly

what year boat engines?

yeti

2005

skennelly

My mag 350 mpi is a 2002 and I have the 3 point drain system.  Bottom of engine has a main collection drain with a blue plug I remove.  2 blue plugs on the raw water pump housing and one on the thermostat housing mainly for ventilation I think.

Others can chime in.

frodo13056

You actually have 4 drain plugs on each engine - not sure why it's called a "3 point drain" system :-)
I also have a pretty extensive checklist (Microsoft Excel spreadsheet) for winterizing my 320 which would be applicable to any Mercruiser engine if you'd like a copy, let me know.

69fastback

There should be the two quick disconnect block drains, and 4 blue plugs. 

yeti

Frodo - exactly what Im looking for  Tks.