Torque Converter stall ??

Change one part on the engine, and you can change the stall speed. I have a 9 1/2 inch converter that will "locked brakes'' stall at 3200 rpm with my 170 slant. That same converter in the same car, but with a 225 engine will stall at 3900 rpm. More cubes = more torque= more stall. This is why, in general, don't pick an "off the shelf" converter, or pick one yourself. Call a reputable converter builder, and give him the info on your engine/car (don't lie), and let him build it. You'll be damn close right off the bat.