Sure does, the harder the ring surface, the longer the seating time, normally. Perhaps the biggest variable is the finish on the cylinders. We just got hooked up with a new machinist who has a state of the art computer controlled power stroke hone. He also has a ton of experience on getting the finish on the cylinder to match the ring material and tension of the rings.... JMO, but I've also found the narrowed rings seat quicker and also have the benefit of less friction between the rings and the cylinder wall resulting in quicker throttle response (though a very slight change) and a lower operating temp in the cylinder area. Spent half a day with the guy and was amazed at some of the combinations he used and the dyno results of them... Now if I just understood half of what he was telling me!!!!!!