Howdy Yo,
First let me say, sorry for the hassle. There is no way your rings should have broken like that. The split groove rings in our kits are supposed to be ductile. They should bend but not break. You can see where it hung on the port. I think the porting you did was irrelevant to the ring failing, it just brought it to a head. We'll certainly replace the parts, or give you a refund.
I really tried to head this of as soon as I found out but, the cat was out of the bag. We haven't been able to keep the supply up to demand on these kits. We'll have hundreds come in and go out the same day. If all the kits had bad rings, I would have recalled them. It was very random, and almost everyone of the failures I've seen was on kits that had the ports modified. I hope this reads more like a reason than a excuse for the failure. There really isn't any excuses.
If anyone else has had the split groove rings actually break. or crack. Please let us know and we'll make it right.
Gregg