Any Honda techs know the difference between the F20C and F22C blocks?

They have different part numbers, but I thought they were interchangable? 11000-PCX-000 & 11000-PCX-010

The cylinder heads have the same part number. 12100-PCX-811

I have a F22 and need to sleeve my block. I wanted to do a core swap to save on car down time. Just curious if I would issues with a F20C block.

Thank you, Patrick

 

F22 and F20 blocks now use the same part number.

At which point they changed over, I do not know. Maybe try Hardtopguy... he might have a serial number answer.