Water level in M

I have a M that is a pressurized system and think I have been filling it to full then it will boil out. I looked and my cap has no rubber left on it and is floppy fit, so bought a 4 lb at TS this weekend, but before I put it on wanted to see what the proper fill level above the core is or below the neck.
 
Max one inch above core. Just covering core is OK 1/5 inch. Filling will blow water out every time as there is no external expansion reservoir as in modern cars. The radiator top tank is the expansion room. Jim
 
Fill it, run it and it will level itself out and you will be fine unless it is leaking from another spot. That's what I do.

BTW - Since it's fall, are you putting straight water in or a 50/50 antifreeze solution? Or are you in a part of the country where it doesn't get below freezing in the winter?
 

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