[Healeys] Rear Main Drain Pipe

[Roger Grace]

I currently have the oil pan off my BJ8 – to replace the gasket with one of those newer silicon style ones.
While scratching around saw that there was a large threaded hole on the rear main. Also one on the front main but smaller diameter.
My manual shows a drain pipe there. 
Is it important ? 
Do I need to fit one ?
Purpose ? 
Read on another forum that removing it reduces leaks from the rear seal ?
What about the front threaded hole ? Manual doesn’t show anything ?
Thoughts please.
rg

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