I've got the Ultrabell/440 combo. Haven't cut the bell off yet. What's your reasoning for the pump bolts coming loose? I've worked on jet engines held together with 1/4" fasteners torqued to 65in-lbs. They don't come loose. The flex plate to torque converter uses those four little bolts, and the driveshaft has those four 1/4" bolts with all the engine power going through them, and they don't come loose or break. I don't think the pump bolts have that much going through them. Isn't the Ultrabell most often used on race cars for safety reasons?