There's a guro thread on 8chan, but it's pretty dead.
I am not asking for guro boards but for any other forums where users have some freedom to post guro and loli as well as other stuff.
Rule 34/ paheal.net has an extensive guro collection featuring tags like dead, death, drowning, hanging, loli, beheading, shooting, skinning...etc, man. Give that a shot. Bots do post content they did not make though, which I think hurts guro creators who need more money to continue their works like WingR. So fair warning.