Where is the serial number on my torque converter?
ATI torque converters have serial numbers stamped across the snout of the converter (the part that goes up against the back of the crank). Any other numbers stamped on the converter are foreign numbers and usually mean that another manufacturer has worked on the converter. Q: What is the deal with big block converters? A: With the advent of affordable 4-1/4″, 4-3/8″ and 4-1/2″ stroke big block Chevy cranks, and the resulting increases in torque and horsepower, has come the increasing need for more efficient converter designs. If your current or future engine combination is based on a long stroke crank, don’t forget that the torque converter may need to be modified or changed to harness the additional power.
