MSD Billet dist.Its not locked ,but it may need to be curved now.I have no idea how much inital or advance timing it has .I dont use timing lights.I prefer to set it by reading the plugs.I couldnt use a light on this one anyway ,since the alt is blocking the tab on the cover where its mounted .I set it by ear for now.I will bring a fresh set of plugs with me to the track when i go ,so i can get an accurate reading ...