For some reason my mind is a blank at the moment, but at least
The Executioner (Ishii / Chiba)
Lone Wolf and Cub: Babycart in Peril
Ricky Oh (Story of Ricky)
Many other Chiba films (The Killing Machine, The Bodyguard, Street Fighter 1&2, the Oyama trilogy etc) also come with a healthy dose of ultra-violence. Toho's 70's samurai films like Demon Spies, Shadow Hunters 1&2 and the rest of the Lone Wolf and Cub films are rather gory, too. Toei's 60's ninja films are pretty violent from what I've heard but I haven't seen those myself. Teruo Ishii's 1973 chambara masterpiece Porno jidaigeki - Bohachi bushido is not one of the most graphic films but is filled with hands, legs and heads flying through the air nevertheless.
Somebody who knows Chang Cheh better than I do can tell us which of his movies are most violent. He's the Chinese Peckinpah so his movies definitely belong to this thread.