Oil hole.

Doing some oil mods on the Block. Anybody have any idea what this oil hole is for in the rear main seal area? Center of picture. Maybe just drainage?

 

I would think so, drain oil rather then oil pressure build up against the rear seal.

 

I don't know how it could be a drain hole being on top
I wondered this too, why is it there

 

Could it be for a locator or retention tab for a seal?

 

pressure relief between the main bearing and the seal next to it

 

So your oil coming out of the bearing doesn't blow past the rear seal. It was a rope after all.

Jim

 

Makes sense.....

 

While your doing work be sure to break ( polish over) all of the edges of those Bearing oil feed holes , as cracks love to start there!