Oil Dipstick Housing Sleeve

[Ptjsk]

I kept trying to put the oil dipstick housing into my block (350), in my '72 Jimmy. As much as I tried it just wouldn't seat all the way into the block.

I went and looked at my '72 stepside and the housing was seated down into the block.

I looked into the block and it appeared there was a sleeve of some sort, which was not allowing the dipstick housing to fully seat into the block.

I was able to pull this sleeve out and wanted to know what you guys thought of this.

For now, I'm leaving it out and my housing is now able to seat completely into the block.

Have any of you guys seen a sleeve like this before?

Thanks,

Pat