I don't like much pure pure pure grind and only grind. In fact, I really can't think of any albums of what people would call pure grind that I enjoy that much. Maybe Night of the Ultimate Mosh by Birdlfesh is the most pure grind album I really like. Not even the archetypal Scum does much for me. So the grindy bands I enjoy are;
Circle Of Dead Children, Alienation Mental, Watchmaker, Brutal Truth, Hybrid Viscery, Enmity, Nasum, Foetopsy, Birdflesh, early Bolt Thrower, Sikfuk, first The Berzerker album (definately heavy grind influence), Embolism, early Cattle Decapitation, Reek Of Shits, Intense Hammer Rage, Sublime Cadaveric Decomposition
Really need to listen to more deathgrind being listed around here. CoDC and Watchmaker are among my all-time favourite bands. Top quality deathgrind is some of the best music around.