Dario, not sure if you fixed this yet, but another posted
the same problem at rec.autos.makers.honda today. See the
thread on the "91 Honda Civic Valve Cover Broke... " there.

This happens a lot. It appears people mostly have success
getting the studs out using one or two techniques.

The studs are a dealer item. I would order it online from,
say, www.cheapesthondaparts.com , using www.slhonda.com to
get the right part number, or just buy from www.slhonda.com
..

"Dario Moreno" <NoSpam@hotmail.com> wrote
> Two of the studs that hold the valve cover of my 92 Accord
> is broken due to
> overtightening for a seal job that I had it done 15K kms
> ago. I am really
> considering it to do it myself this time because obviously
> paying for a
> professional does not always get it done right. How an
> easy job is it for a
> DIY?. I have the electronic version of the Service Manual
> but I could not find
> the information. Are these studs a dealer item? Thanks.