Identify These

[Bingster]

What are these engine openings?

[P15-D24]

Anchor bolt on brakes, welch plug opening on block 

[Bingster]

Ah, so that's the inside of a welch plug.

[Reg Evans]

No, that's the inside of the block.

[desoto1939]

On the first picture this is the eccentric pin that control the  heel of the brake shoe. This is an eccentric pins and is not a perfect  circle. You have a metal clip that goes in a slot to hold the brake shoe onto this anchor pin. But on your example it does not look to be the horseshoe type clip or otherwise known as a c clip.  There is a flat washer that has felt on the inside of the washer cup. This should also get a light oil on the felt waster. The oil keeps the eccentric pin wet with a slight film of oil to permit the shoe to pivot on the pin, Do not over oil the felt washer.  So do you have a homemade lip or is this the correct style for your car.

Do not adjust the eccentric pins unless you have access to an Ammco brake gage 1750 tool or you will then have your brake shoes out of alignment.

Rich Hartung