LiveGore, GoreSee or deadhouse(dot)org, though keep in mind these have popups, so use Adblock.
Also all colours of bigotry are common on gore websites, so if you're uncomfortable with rampant, blatant racism (of all kinds, you'll often see white supremacists arguing with black supremacists), sexism, homophobia, etc. then beware. Kinda sounds stupid to issue such a warning, but some people don't want every page they click on talking about how being a part of a group they were born into makes them a subhuman and everyone in this group deserves to suffer the horrific fate shown in the video.