Search:

Are you talking about nouns with -й endings in nominative?
It seems, they all form genitive plural with "-ев/-ёв". The further refinement might be impossible:

каравай - караваев
комментарий -...

I think it must be very good site, if it contains such neat pieces of information. But they too could switch around something ;)

Let me think:
отцов
молодцов
венцов
кузнецов
песцов
...

It looks like -цов/-цев(3) are now crossed (or should I write 'mixed up'?)
конец - концом - концов
палец - пальцем - пальцев

Very close, but Genitive plural will be пальцев not пальцов