Technical What is this hole for?

[Arancia]

Having just completed the engine rebuild and mounted the gearbox and transmission to it I discovered this hole on the underside of the crankcase. It isn’t threaded and I have seen it in another photo of a completed car.
Before I go ahead and refit the engine can anyone tell me what this is for please? Hope I haven’t missed anything out in the rebuild!
Thanks

 

[GettinBetter]

I dont' have a definitive answer, but don't be surprised if (sombody confirms, that) its a location hole used when the manufacturers were machining the block.

 

[grubscrew]

That’s a locating hole for factory, where it sits and is held down on an engineered flat surface during the boring out the aluminium of cylinder block to receive the barrels.

 

[Arancia]

I dont' have a definitive answer, but don't be surprised if (sombody confirms, that) its a location hole used when the manufacturers were machining the block.

Many thanks for your reply.

 

[Arancia]

That’s a locating hole for factory, where it sits and is held down on an engineered flat surface during the boring out the aluminium of cylinder block to receive the barrels.

Thanks Grubscrew. About to fill with oil - I’ll let you know if it runs out through this hole