I bought my first and only Coan back in the early 90's for a 13 second 383 Roadrunner........Paid over $500, put it in, drove it around the block, hammered on it a few times, and broke it......When I first stall tested it, it would go to 4,200........After hammering on it for about 10 minutes, it made a huge "thunk" sound.......I thought the driveshaft came out.......after that it would only stall to about 2,200........I pulled it out and the stator splines were split and shattered..........I called them to explain what happened and their very sarcastic response was; "That converter isn't for a B1 motor".........