440 Source Big Block Alum. Cylinder heads

i am calling Kim at 440 source in the morning to break bad news to him. This is the second set of heads i have got from them. The first pair cracked after about 15 passes. he made them good and i give him credit for that. I got the second set installed and ran them in the garage and they were fine. Car was being painted so my first trip to the track was last Saturday 4-25-09. Drove the car around in the pits to put heat in it and all was fine. Made the first pass and came back to pits and both heads were cracked and leaking water, car never gets hot or nothing. I think its just piss poor quality from china, they might work fine on a street car but they cant handle a 8.90 dragster. I hope they get all the problems worked out, they have very good customer service in my opinion, but let's see what happens when i ask for a refund. I was about to buy a 500 inch stroker kit from them, glad i did not.