Can Small Bolt spindles run Big Bolt rotors?

72bluNblu said
The only issue I see with all of this is that you’re assuming he has late model drum spindles. He said he has BBP drums, which means it’s possible he has pre-‘73 B or E body spindles. Which use different bearings than the 73+ stuff.

I’m just going off the OP’s post, if he has BBP drums then he doesn’t have A-body drum spindles.
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Perhaps, just depends what he has on there. The OP doesn't seem to really know what he has so we'll have to wait until he pulls it apart. The car should have late model A body knuckles on there but someone could've swapped on B body drum brakes.