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OK, sorry for my confusion…Was looking at #23, but got confused, those parts are the lower bearing pieces, not the upper bearing….The vacuum port is in the groove where you found the oring….
So, looks like you don’t use the oring on this engine. I thought you had a 1956 engine, but could only find this 57 parts book…Oh well, sorry…
It’s too bad engineering couldn’t have put the vacuum hole just above the groove that would normally hold the oring, then you could have both systems….I guess this might not have worked out because the crankcase mag plate pilot bushing would be just behind the hole if it was raised up. My issue with this system has always been that removing the oring allows gas/oil to sneak by between the upper bearing case and block. This engineering “improvement” added a bit of a leak, I guess they felt the vacuum port would make up for it….
I see traces of the red gel seal on the block which would indicate this powerhead has been apart before, which would explain how the oring got in there. D