320 freeze plug size.

Hi all,
Hope somebody can help here. The front engine block freeze plug (the one under the inlet/exhaust manifold) on my 1948 Roadmaster Sedanette is weeping slightly. I’m in the UK and therefore wondered if anybody can let me know the diameter of this plug so that I can source one locally.

regards
Karl
 
Looking at a '51 320, the plug is still installed, but using a caliper, it looks like it is probably 1-15/16".
If it is just weeping, how about some "Bars Leak" or other radiator stop leak product.
 
Hi Bob,
thanks for this, that does look right to me I have to say. Yes, I tried some stop leak but it hasn’t done the trick unfortunately. Saying that, I only ran the engine in my garage for 30 minutes as it’s off the road having some paintwork at the moment so may not have worked it’s way round yet. Appreciate your response - thanks!
 
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