cast hub 1

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cast hub 2

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cast hub 3

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new rubber 4" to 6" boot and closet flange

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4" PVC

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Steve (Ca) & Joint-Runner were right. I still had existing okrum in the hub. Once cleaned out the more room I had for the 4" PVC. Check below

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Plus the rubber doughnut for a smug fit.

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Finished rubber doughnut install.

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Finished product. I forgot to take a pic of the 4" PVC inserted into the dough nut before putting the 4" to 6" rubber reducer you see around the PVC and cast iron hub. I put it on on the PVC prior to forcing into the rubber dough nut shown above. It was a very snug fit so I had to you use KY petroleum.