M - Radiator Fit

I just received a radiator for my M and wanted to test the fit against the grille and noticed the mounting holes on the grille are about an inch higher than the holes in the radiator. The grille contacts the overflow tube on the radiator and it seems like if that weren't the case the grill would drop down about an inch to lay flush against the radiator tank and the holes would line up. Am I right that that is how it should fit?
 
I hear you, but not sure whats going on,usually the over flow fits in the recess, built for it, in the hood, and then the bolts on the side go in!
 
I can see how that would work if there were a notch or something at the rad cap hole to allow it to run in the recess down the center (I just wanted to confirm that was the issue before I go cutting a notch in the grille)
 
On ebay I see a grille that already has a notch in it so I am guessing that's what is going on (maybe the older radiators didn't have an overflow tube there?)
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You do realise they used 2 styles of radiators on a m, early were non pressurized later were pressurized. The fill neck and caps are different on both. Grill may be as well.
 
(quoted from post at 11:34:41 11/16/18) You do realise they used 2 styles of radiators on a m, early were non pressurized later were pressurized. The fill neck and caps are different on both. Grill may be as well.

Exactly. The grill for the non-pressurized radiator did not have the notch behind the radiator neck.
 
Mine is a non-pressurized. It is a 1941 model.
If I understand the serial number, the casting numbers, and the information gleaned from this site it rolled out of the factory the last week of December 1941.
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From what I understand 41s were stock non-pressurized (as is the old one pulled off my M) but once the pressurized radiators came out no one made the old ones and so if the radiator was ever replaced it likely has a pressurized radiator. Also anyone know what the benefit of having that 4lbs of pressure actually is?
 
An increase in pressure in the cooling system raises the boiling point of the water or water and anti-freeze solution in the system. With the increased pressure of even 4 PSI it would raise the boiling point of straight water if used w/o anti-freeze to be somewhat higher then 212 F at sea level. Water boils at less then 212 F as you increase in elevation above sea level. Hope this answers your question, Hal.
 

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