Who did you get it from? When many of the companies claim a "10 minute run-in" that would be hard to do without a piston. These kits are supposed to bolt on, no assembly of the motor.
There could be a whole bunch of kits like this and a few Chinamen LTAO at us Americans. C'mon, these are people that put plastic in their milk to raise the milkfat count and paint our toys with lead paint. They are a pretty funny bunch