Yup.
I have installed them dry before in the beginning on a fresh engine build before I heard that GM had this service bulletin and this is how the service techs were fixing GM's bo-bo at the dealerships with them originally installing them dry at the plant. As long as everything is VERY clean and degreased, you can get a good seal. But later down the road...it will start seeping, then its all over.
When I do them now, both sides of the gasket get RTV gasket maker. I use the "Ultra Gray" RTV my Permetex on all my engines. Only other color I use is the copper, high temp. stuff for exhaust doughnut gaskets on headers. Front and the rear cover gets a little dab in the lower corner where it meets the oil pan and the main bearing cap. There are a lot of other places that need attention of some RTV on a build, but we will save that for another post.
Hope that helps.
~F~