Fred, regardless of who you use for your motor, there is not much of a warranty in high hp motors. The very best thing you can do, is have them dyno and break in the motor. If there are any internal problems, you usually find out in the dyno pulls. If there is a problem at that point, its the builders problem. Once it is dyno'd and broken in, you should not have any problems provided you don't overheat it or run it low on
oil. Good luck, Scott.